He returned to see his diciplies, told them about carrying on his work, and spreading the word of God, and then he was taken up into Heaven, to sit at the right hand of God The Father, where he will remain until the end of the world, when he will return to judge the living and the dead ...
So he never actually 'died' at all, which is the cornerstone of the Christian faith - anyone who believes in God will never die, but will live in everlasting peace in heaven.