Qur'anic Answers

A major difference between Muslims and Christians is what happened to Jesus at the end of his earthly life. For Christians, Jesus was crucified and then resurrected, which forms the central pillar of their faith. On the other hand, mainstream Islam teaches Jesus was never crucified but was instead raised alive by Allah. 

Leaving Islam is one of the most serious actions a Muslim can commit, and in traditional circles, can even warrant the death penalty.