The easiest way to determine the truth is to compare what the Bible says about God, against what the Koran says about Allah: We know that God is without sin. it’s everywhere in scripture. God tells us it’s a sin to lie, and since he is sinless, he does not lie. (Forgive me if i am repeating what anyone else has said, I haven’t read through the entire thread) Now look at what the koran says about Allah:
The Quran describes Allah as the best deceiver there is, a liar who is not above using the same evil and wicked schemes of his opponents. For example, the Quran calls Allah a makr, in fact the best makr there is:
But they (the Jews) were deceptive, and Allah was deceptive, for Allah is the best of deceivers (Wamakaroo wamakara Allahu waAllahu khayru al-makireena)! S. 3:54; cf. 8:30
Other texts that identify Allah as a makr include:
Are they then secure from Allah’s deception (makra Allahi)? None deemeth himself secure from Allah’s deception (makra Allahi) save folk that perish. S. 7:99
So they schemed a scheme: and We schemed a scheme (Wamakaroo makran wamakarna makran), while they perceived not. S. 27:50
The quotes from the koran prove that we do not worship the same God.
And as someone else mentioned, they deny that Jesus was the son of God.
Revelation 22:12 “Look, I am coming soon! My reward is with me, and I will give to each person according to what they have done.