Christianity is the belief that a cosmic Jewish zombie who is his own father can make you live forever if you symbolically eat his flesh and telepathically tell him you accept him as your master, so he can remove an evil force from your soul that is present in all humanity because a rib-woman was convinced to eat from a magical tree by an infinitely sadistic being disguised as a talking snake with legs.
Islam is the belief in the same old testament God of Christians - but believe that the Bible has got it wrong, Jesus was only a prophet and not the son of God and also not the same God as himself. And that god's name is Allah, not Yahweh. And he sent one of his angels down to earth around 600 years after Jesus died to gradually (23 years) dictate this to an illiterate arabian man called Mohammed.
As a christian, or a muslim, please could you explain to me why you believe these ancient stories are true, and cannot see how ridiculous the stories are to people who dont.