Among Muslims, it is known that the Injil published by Isa (Jesus), but Christians told me that that wasn't given to Jesus. They told me that it was written by his crucifixion. So how do I merge these two views?
In my belief there aren't any contradictions in these two, so I don't see the need to merge them. We have to believe in both of them. It was given to Jesus, but we don't have any firm chain of narrators or keepers for about 200 years. As we know by the time of Jesus life that Christianity was preached in secrecy, any public speech about it would be a death sentence.