Muhammad’s “angel” “Gabriel” or “Jibril” is not the Gabriel of the Bible.
The commencement of the Divine Inspiration to Allah’s Messenger was in the form of good dreams which came true like bright daylight, and then the love of seclusion was bestowed upon him. He used to go in seclusion in the cave of Hira where he used to worship (Allah alone) continuously for many days before his desire to see his family. He used to take with him the journey food for the stay and then come back to (his wife) Khadija to take his food likewise again till suddenly the Truth descended upon him while he was in the cave of Hira.
The angel came to him and asked him to read.
The Prophet replied, “I do not know how to read.”
The Prophet added, “The angel caught me (forcefully) and pressed me so hard that I could not bear it any more. He then released me and again asked me to read and I replied, ‘I do not know how to read.’ Thereupon he caught me again and pressed me a second time till I could not bear it any more. He then released me and again asked me to read but again I replied, ‘I do not know how to read (or what shall I read)?’ Thereupon he caught me for the third time and pressed me, and then released me and said, ‘Read in the name of your Lord, who has created (all that exists), created man from a clot. Read! And your Lord is the Most Generous.” (96:1-3)
Then Allah’s Messenger returned with the Inspiration and with his heart beating severely. Then he went to Khadija bint Khuwailid and said, “Cover me! Cover me!”
They covered him till his fear was over and after that he told her everything that had happened and said, “I fear that something may happen to me.”
Khadija replied, “Never! By Allah, Allah will never disgrace you. You keep good relations with your kith and kin, help the poor and the destitute, serve your guests generously and assist the deserving calamity-afflicted ones.”
Khadija then accompanied him to her cousin Waraqa bin Naufal bin Asad bin ‘Abdul ‘Uzza, who, during the pre-Islamic Period became a Christian and used to write the writing with Hebrew letters. He would write from the Gospel in Hebrew as much as Allah wished him to write. He was an old man and had lost his eyesight.
Khadija said to Waraqa, “Listen to the story of your nephew, O my cousin!”
Waraqa asked, “O my nephew! What have you seen?”
Allah’s Messenger described whatever he had seen.
Waraqa said, “This is the same one who keeps the secrets (angel Gabriel) whom Allah had sent to Moses. I wish I were young and could live up to the time when your people would turn you out.”
Allah’s Messenger asked, “Will they drive me out?”
Waraqa replied in the affirmative and said, “Anyone (man) who came with something similar to what you have brought was treated with hostility; and if I should remain alive till the day when you will be turned out then I would support you strongly.”
But after a few days Waraqa died and the Divine Inspiration was also paused for a while.
Sahih al-Bukhari 3
Notice in the Muslim translation that “squeeze” has been replaced with “pressed” to hide the fact that Jibril attacked Muhammad. Also, note that “(angel Gabriel)” has been added by Muslim translators. Notice that neither Muhammad nor the “angel” names the “angel”.
Here are the first verses that come, not from Allah, but from Jibril, via Muhammad:
96:1 Recite in the name of your Lord who created 2 Created man from a clinging substance.
3 Recite, and your Lord is the most Generous – 4 Who taught by the pen 5 Taught man that which he knew not.
Koran 96:1-5
Notice that “Allah” isn’t named, instead “your Lord” is mentioned. The word “created” is repeated, contradicting the oneness of Allah. We humans aren’t created from a “clinging substance”. The word “Recite” is repeated, again contradicting the oneness of Allah. We know from the hadith that Muhammad can’t read, therefore he can’t “Recite” – all he can do is sing. There’s no generosity from Allah. Allah doesn’t teach. To claim that there’s a “pen” with Allah is shirk. The word “taught” is repeated twice, yet again contradicting the oneness of Allah.
There’s another hadith about Jibril on a throne, mocking Allah and his throne:
Yahya reported:
I asked Abu Salama what was revealed first from the Qur’an.
He said: “0, the shrouded one.”
I said: Or “Recite.”
Jabir said: “I am narrating to you what was narrated to us by the Messenger of Allah. He said: ‘I stayed in Hira’ for one month and when my stay was completed, I come down and went into the heart of the valley. Somebody called me aloud. I looked in front of me, behind me, on the right of my side and on my left, but I did not see anybody. I was again called and I looked about but saw nothing. I was called again and raised my head, and there on the Throne in the open atmosphere he, i. e. Gabriel (peace be upon him) was sitting. I began to tremble on account of fear. I came to Khadija and said: ‘Wrap me up.’ They wrapped me up and threw water on me and Allah, the Exalted and Glorious, sent down this: ‘you who are shrouded! arise and deliver warning, your Lord magnify, your clothes cleanse.'”
Sahih Muslim 161d
the prince of the power of the air, the spirit that is now at work in the sons of disobedience
Excerpt, Ephesians 2:2
In other words, Satan.

“Certainly he saw of the greatest signs of Allah”
(al-Qur’an, liii. 18) or Koran 53:18
imply that he saw Gabriel in his (original) form and he had six hundred wings.
Sahih Muslim 174c
Narrated Aisha:
Whoever claimed that (the Prophet) Muhammad saw his Lord, is committing a great fault, for he only saw Gabriel in his genuine shape in which he was created covering the whole horizon.
Sahih al-Bukhari 3234
Narrated Masruq:
I asked Aisha “What about His Statement: ‘Then he (Gabriel) approached And came closer, And was at a distance Of but two bow-lengths Or (even) nearer?'”(53:8-9)
She replied, “It was Gabriel who used to come to the Prophet in the figure of a man, but on that occasion, he came in his actual and real figure and (he was so huge) that he covered the whole horizon.”
Sahih al-Bukhari 3235
Masruq reported:
I said to ‘A’isha:
What about the words of Allah: “Then he drew nigh and came down, so he was at a distance of two bows or closer still: so He revealed to His servant what He revealed”? (Koran 50:8-10)
She said: “It implies Gabriel. He used to come to him (the Holy Prophet) in the shape of men; but he came at this time in his true form and blocked up the horizon of the sky.”
Sahih Muslim 177d
What was Masruq referring to? Koran 53:1-12, in particular, verses 8-10:
53:1 By the star when it descends, 2 Your companion [i.e., Muḥammad] has not strayed, nor has he erred, 3 Nor does he speak from [his own] inclination.
4 It is not but a revelation revealed, 5 Taught to him by one intense in strength [i.e., Gabriel] – 6 One of soundness. And he rose to [his] true form 7 While he was in the higher [part of the] horizon.
8 Then he approached and descended 9 And was at a distance of two bow lengths or nearer.
10 And he revealed to His Servant what he revealed [i.e., conveyed].
11 The heart did not lie [about] what it saw.
12 So will you dispute with him over what he saw?
Koran 53:1-12

53:13 And he certainly saw him in another descent 14 At the Lote Tree of the Utmost Boundary – 15 Near it is the Garden of Refuge – 16 When there covered the Lote Tree that which covered [it].
17 The sight did not swerve, nor did it transgress.
18 He certainly saw of the greatest signs of his Lord.
Koran 53:13-18

But most of the time, Gabriel/Jibril was imaginary, inside Muhammad’s head:

Narrated Abu Salama:
Aisha said,
Once Allah’s Messenger said (to me),
“O Aish (Aisha)! This is Gabriel greeting you.”
I said, “Peace and Allah’s Mercy and Blessings be on him, you see what I don’t see”
She was addressing Allah’s Apostle.
Sahih al-Bukhari 3768
Narrated Aisha:
Allah’s Messenger said:
“O Aisha! This is Gabriel sending his greetings to you.”
I said, “Peace, and Allah’s Mercy be on him.”
Aisha added: “The Prophet used to see things which we used not to see.”
Sahih al-Bukhari 6201
As you can see, Jibril is inside Muhammad at this time, as a demon or alternate personality of Muhammad.

But, perhaps you doubt that Jibril is an alternative personality? Here’s Muhammad on the topic:
Narrated Samura:
The Prophet said:
Last night I saw (in a dream) two men coming to me. One of them said,
“The person who kindles the fire is Malik, the gate-keeper of the (Hell) Fire, and I am Gabriel, and this is Michael.”
Sahih al-Bukhari 3236
Notice Muhammad is having a dream, he saw “two men coming to me”, then one man says: “The person who kindles the fire is Malik, the gate-keeper of the (Hell) Fire, and I am Gabriel, and this is Michael.”
Let’s emphasize that: “I am Gabriel (Jibril the demon)”. Muhammad admits to multiple personalities or demon possession in his dream and relates that to Samura. The two men are clearly “Malik” and “Michael”.
The information that comes from Jibril is also false, as shown by the hadith Sahih al-Bukhari 4480.
Perhaps you doubt that calling Jibril a demon is wrong? Check out the opinion of others who were there at the time, according to the hadith:
Narrated Jundab bin Abdullah:
Gabriel did not come to the Prophet (for some time) and so one of the Quraish women said, “His Satan has deserted him.”
So came the Divine Revelation: “By the forenoon And by the night When it is still! Your Lord (O Muhammad) has neither Forsaken you Nor hated you.” (93:1-3)
Sahih al-Bukhari 1125
One of the Quraish women said, “His Satan has deserted him.” His Satan = demon. Then comes the “Divine Revelation” confirming that Muhammad’s Satan (or demon) is with him: “Your Lord (O Muhammad) has neither Forsaken you Nor hated you.” And this becomes Koran 93:1-3 here:
93:1 By the morning brightness 2 And [by] the night when it covers with darkness, 3 Your Lord has not taken leave of you, [O Muhammad], nor has He detested [you].
Koran 93:1-3
For more, see Koran 93:1-11.
Obviously, a revelation that a demon, “His Satan”, is still with Muhammad, is not divine. Muhammad should have said: “My demon has left, Allah is with me, and relieves me.” Or something like that, but perhaps he wasn’t quite rational:
Abu Sa’id exclaimed, “How hot your fever is, Messenger of Allah!”
He said, “We are like that. The affliction is hard on us, but the reward is doubled for us.”
Excerpt, Al-Adab Al-Mufrad 510
Notice that Muhammad is speaking in the plural, “We”, and these two sentences are NOT in Koran at all. So this means either the Koran is corrupt, or it’s the demon, Jibril is speaking in the plural to Abu Sa’id, thus confirming the demon remains in Muhammad.
Ibn Abbas reported Allah’s Messenger [Muhammad] as saying, “The devil is couching at the heart of the son of Adam. When he mentions Allah he withdraws, but when he is neglectful he makes evil suggestions.”
Mishkat al-Masabih 2281
He [Muhammad] used to say after the (opening) Takbir (for prayer), “I seek refuge in Allah, the All-Hearing and the All-Knowing from the accursed devil, from his madness or evil suggestion (Hamz), from his puffing up (Nafkh), and from his witchcraft (Nafth).”
Bulugh al-Maram, Book 2, Hadith 153
Muhammad also tries to impute his demon upon others:
Jabir reported the Prophet as saying, “Do not visit women whose husbands are away from home, for the devil circulate in you like your blood.”
He was asked if this applied to him also and said, “To me also, but Allah has helped me against him so that I may be safe.”
Mishkat al-Masabih 3119
Recall that Muhammad desired his adopted son’s wife for himself, then abolished adoption and married his ex-adopted son’s wife. Obviously, Allah didn’t help.
Abu al-Malih reported on the authority of a man:
I was riding on a mount behind the prophet. It stumbled. Thereupon I said: “May the devil perish!”He [Muhammad] said: “Do not say: ‘May the devil perish!’ For you say that, he will swell so much so that he will be like a house, and say: ‘by my power’. But say: ‘in the name of Allah’; for when you say that, he will diminish so much so that he will be like a fly.
Sunan Abi Dawud 4982
Aisha, the wife of Allah’s Apostle, reported that one day Allah’s Messenger came out of her (apartment) during the night and she felt jealous. Then he came and he saw me (in what agitated state of mind) I was. He said:
“Aisha, what has happened to you? Do you feel jealous?”
Thereupon she said: “How can it be (that a woman like me) should not feel jealous in regard to a husband like you.”
Thereupon Allah’s Messenger said: “It was your devil who had come to you”.
And she said: “Allah’s Messenger, is there along with me a devil?”
He said: “Yes.”
I said: “Is a devil attached to everyone?”
He said: “Yes.”
I (Aisha) again said: “Allah’s Messenger, is it with you also?”
He said: “Yes, but my Lord has helped me against him and as such I am absolutely safe from his mischief.
Sahih Muslim 2815
Notice that Aisha doesn’t recognise a demon inside herself, only her jealousy. Muhammad lies about his demon, as he was up to mischief already, as shown in his action earlier.
Abdullah b. Mas’ud reported that Allah’s Messenger said:
“There is none amongst you with whom is not an attache from amongst the jinn (devil).”
They (the Companions) said: “Allah’s Messenger, with you too?”
Thereupon he said: “Yes, but Allah helps me against him and so I am safe from his hand and he does not command me but for good.”
Sahih Muslim 2814 a
Notice that the Companions also do not notice a demon in themselves.
Notice Muhammad lies about the demon, claiming that Allah only “helps”. Surely it would be better to NOT have a demon right? So Allah is revealed as being ineffectual here. Particularly when Muhammad’s personal prayer is revealed here:
Narrated Abul Azhar al-Anmari:
When the Messenger of Allah went to his bed at night, he would say: “in the name of Allah, I have laid down my side for Allah. O Allah! forgive me my sin, drive away my devil, free me from my responsibility, and place me in the highest assembly.”
Sunan Abi Dawud 5054
Notice that at night, Muhammad prayed to Allah to: “drive away my devil”. Obviously, Allah was ineffectual, and Muhammad had a demon in him.

Another opinion on who the demon is:
Now you might be thinking, surely Jibril is Gabriel, the angel mentioned in the Bible? But, Jibril is not Gabriel. Jibril repeatedly shows that he’s not Gabriel, doesn’t recognise himself as Gabriel, and doesn’t have the powers of Gabriel.

Here’s Gabriel in the Torah or Old Testament:
15 Then it happened, when I, Daniel, had seen the vision and was seeking the meaning, that suddenly there stood before me one having the appearance of a man. 16 And I heard a man’s voice between the banks of the Ulai, who called, and said, “Gabriel, make this man understand the vision.” 17 So he came near where I stood, and when he came I was afraid and fell on my face; but he said to me, “Understand, son of man, that the vision refers to the time of the end.”
18 Now, as he was speaking with me, I was in a deep sleep with my face to the ground; but he touched me, and stood me upright.
NKJV Daniel 8:15-18
20 Now while I was speaking, praying, and confessing my sin and the sin of my people Israel, and presenting my supplication before the Lord my God for the holy mountain of my God, 21 yes, while I was speaking in prayer, the man Gabriel, whom I had seen in the vision at the beginning, being caused to fly swiftly, reached me about the time of the evening offering. 22 And he informed me, and talked with me, and said, “O Daniel, I have now come forth to give you skill to understand.
NKJV Daniel 9:20-22
Then there’s Gabriel in the Bible or New Testament:

11 Then an angel of the Lord appeared to him, standing on the right side of the altar of incense. 12 And when Zacharias saw him, he was troubled, and fear fell upon him.
13 But the angel said to him, “Do not be afraid, Zacharias, for your prayer is heard; and your wife Elizabeth will bear you a son, and you shall call his name John.
NKJV Luke 1:11-13
18 And Zacharias said to the angel, “How shall I know this? For I am an old man, and my wife is well advanced in years.”
19 And the angel answered and said to him, “I am Gabriel, who stands in the presence of God, and was sent to speak to you and bring you these glad tidings. 20 But behold, you will be mute and not able to speak until the day these things take place, because you did not believe my words which will be fulfilled in their own time.”
21 And the people waited for Zacharias, and marveled that he lingered so long in the temple. 22 But when he came out, he could not speak to them; and they perceived that he had seen a vision in the temple, for he beckoned to them and remained speechless.
NKJV Luke 1:18-22

26 Now in the sixth month the angel Gabriel was sent by God to a city of Galilee named Nazareth, 27 to a virgin betrothed to a man whose name was Joseph, of the house of David. The virgin’s name was Mary. 28 And having come in, the angel said to her, “Rejoice, highly favored one, the Lord is with you; blessed are you among women!”
29 But when she saw him, she was troubled at his saying, and considered what manner of greeting this was. 30 Then the angel said to her, “Do not be afraid, Mary, for you have found favor with God. 31 And behold, you will conceive in your womb and bring forth a Son, and shall call His name Jesus. 32 He will be great, and will be called the Son of the Highest; and the Lord God will give Him the throne of His father David. 33 And He will reign over the house of Jacob forever, and of His kingdom there will be no end.”
34 Then Mary said to the angel, “How can this be, since I do not know a man?”
35 And the angel answered and said to her, “The Holy Spirit will come upon you, and the power of the Highest will overshadow you; therefore, also, that Holy One who is to be born will be called the Son of God. 36 Now indeed, Elizabeth your relative has also conceived a son in her old age; and this is now the sixth month for her who was called barren. 37 For with God nothing will be impossible.”
38 Then Mary said, “Behold the maidservant of the Lord! Let it be to me according to your word.” And the angel departed from her.
NKJV Luke 1:26-38
While people react in fear to Gabriel, Gabriel reassures them and says: “you have nothing to fear.” Gabriel never attacks them and demonstrates the power of GOD.
But even if we or an angel from heaven should preach a gospel other than the one we preached to you, let them be under God’s curse!
NIV Galatians 1:8
Instead, Jibril attacks Muhammad and doesn’t reassure him. Jibril also has no power and can’t make Muhammad read.
96:1 Recite in the name of your Lord who created 2 Created man from a clinging substance.
3 Recite, and your Lord is the most Generous – 4 Who taught by the pen 5 Taught man that which he knew not.
Koran 96:1-5
Thus you know Jibril ≠ or not equal to Gabriel. Muhammad was “infected” by a “demon” or a neglected, antisocial personality. From this you can see that Islam doesn’t follow after Christianity, Muhammad was either deceived or a deceiver, Allah is not GOD and so is false, so Koran comes from Muhammad and so is false and Islam is a lie, a deception and so is false.
