Many people insist that all (or at least most) religions lead to the same God. But the facts do not bear that out. They each have mutually exclusive truth claims — that is, they can’t all be right. And if Christianity is right then all the others are false.
This passage in the Koran explicitly denies that Jesus died on the cross:
And for claiming that they killed the Messiah, Jesus, son of Mary, the messenger of GOD. In fact, they never killed him, they never crucified him – they were made to think that they did. All factions who are disputing in this matter are full of doubt concerning this issue. They possess no knowledge; they only conjecture. For certain, they never killed him. Instead, GOD raised him to Him; GOD is Almighty, Most Wise.
Koran, Sura 4:157-158
That is a very clear claim that Jesus did not die on the cross, whereas we know from the Bible and even secular history that Jesus did die on the cross. Then one guy came along over 500 years later with a radical new story about how Jesus didn’t die on the cross, though he had zero evidence behind it. Zero.
When I speak with Muslims I always bring this example up matter-of-factly. First I clarify with them that this is what the Koran teaches. They always agree, except one guy who wasn’t familiar with it (I showed him the reference and I think it helped plant some seeds of doubt).
Then I just explain why I hold the view that Jesus died on the cross: Lots of testimonies written close to the event and plenty of secular historians backing it up vs. one guy over 500 years later with an alleged vision from God. No serious historian would consider the Islamic version to be more credible.
Is it possible that Mohammad was right about Jesus not dying on the cross? In a hyper-technical sense, I suppose so. But you’d have to throw every historical event ever up for grabs using that approach.
This isn’t some small issue, either. It is an essential claim for Christianity and a key error in the Koran.
Muslims will try to claim that the Bible has been corrupted but even skeptical textual critics will concede that we know with 99.5% accuracy what the originals said and 100% on key doctrines. I am not aware of a textual issue with any passage that would call the crucifixion of Jesus into question. For the Muslim claim to be true then all the passages about Jesus’ death on the cross would have to be wrong — and there are a lot of them!