Jesus (AS) is alive in the sky, s here is no question of resurrection.
What many Christians believe today does not mean necessarily the real teachings of Jesus (AS).
1. Qur'an is very clear that Jesus (Easa) (AS) was never killed nor crucified despite the criminal attempt of his enemies to kill and crucify him, but they killed and crucified a person who looked like him. (Al-Nisaa' 157).
2. Jesus was raised from the earth to the sky (Al-Nisaa' 158).
3. Jesus is still alive in the sky and will come down to the earth and will be a follower and supporter of Imam Al-Mahdi (AS).