Fun fact: Muslims actually have to believe that Jesus Christ and the gospels were correct. Muhammad said so, and it is part of their holy book. Why does it say this? Well, Muhammad was actually taught and trained by a heretical Christian priest who was banished by other Christians. He, along with other heretics, brought their version of Christianity to Muhammad that stressed that Jesus was not the Son of God, though they had no gospels or official texts to back them up. They claimed to Muhammad that this was the truth, and that the gospels said this, so, Muhammad proclaimed that Jesus Christ told the truth and that the gospels were accurate. When Muslims came into contact with actual Christians and realized that, oh, wait, these gospels say something totally different from what we believe, they had a big problem on their hands. Their holy book says the gospels are true and that Jesus Christ was genuinely sent by God. Why would Jesus Christ lie and say He is the Son of God, etc, if He was a prophet, and why would all of these gospels and Christians contradict OUR prophet? Well, they didn't really have an answer for this. After a couple hundred years of being laughed at and bullied, the Muslims dug up a fake copy of the gospels and claim that this is the real gospel and all the other ones (you know, that all early Christians and the early church agreed upon and used, including direct apostles of Jesus who were still alive) were fake. This gospel dates from about the year 1000 and has been carbon dated and linked to around that year. If you talk to any Muslim today, they will cite this blatantly false forgery as the true Christian gospel despite all the evidence to the contrary.
This one argument totally debunks Islam because if you really want to believe in Islam, you have to believe that Muhammad said that Jesus Christ was sent by God and was a true prophet, and that the gospels are true. But if you believe that, you can't be a Muslim.
