You will surely find the most intense of the people in animosity toward the believers (to be) the Jews and those who associate others with Allah ; and you will find the nearest of them in affection to the believers those who say, "We are Christians." That is because among them are priests and monks (i.e. persons entirely devoted to the service of God, as are the muslims) and because they are not arrogant (Quran 5:82)
They have certainly disbelieved who say, " Allah is the third of three (in a Trinity)." And there is no god except one God (Quran 5:73)
Say, "He is Allah , [who is] One, Allah , the Eternal Refuge. He neither begets nor is born, Nor is there to Him any equivalent." (Quran: Al-Ikhlas)
To whom will ye like Me, and make Me equal, and compare Me, that we may be like? Ye that lavish gold out of the bag, and weigh silver in the balance, ye that hire a goldsmith, that he make it a god, to fall down thereto, yea, to worship. He is borne upon shoulder, he is carried, and set in his place, and he standeth, from his place he doth not remove; yea, through one cry unto him, he cannot answer, nor save him out of his trouble. Remember this, and stand fast; bring it to mind, O ye transgressors. Remember the former things of old; that I am God, and there is none else, I am God, and there is none like Me; (Isaiah 46:5-9)
Thus saith the LORD, the King of Israel, and his Redeemer the LORD of hosts, I am the first, and I am the last, and beside me there is no God (Isaiah 44:6)
Hear, O Israel, the LORD our God, the LORD is one (Isaiah 45:4)
No one's eyes had ever, nor can anyone ever see Allah
No man hath seen God at any time; the only begotten son, which is in the bosom of the Father, he hath declared him (John 1:18)
Nor can we imagine or conceptualize Allah
And call no man your father upon the earth: for one is your Father, which is in heaven (Mathew 23:9)
“...Why don’t they research the Qur’an? Don’t they realize that if it was from someone other than Allah, they would find many discrepancies in it...” (Quran 4:82)
"...He (Jesus) was no more than a servant: We granted Our favour to him, and We made him an example to the Children of Israel..." (Quran 43:59)
"...Then woe to those who write the Book with their own hands and then say: "This is from God", to traffic with it for a miserable price! - Woe to them for what their hands do write, and for the gain they make thereby..." (Quran 2:79)
"...and if ye are in doubt as to what We have revealed from time to time to Our servant (Quran), then produce a Sura like thereunto; and call your witnessess or helpers besides Allah, if your are true. But if ye cannot, and surety ye cannot, then fear the fire whose fuel is men and stones, which is prepared for those who reject Faith..." (Quran 2:23-24)