Is Jesus followers are christain?

''That the said [in boast],we killed Christ Jesus,the son of Mary,the messenger of Allah. '' But they killed him not,nor crucified him, but so it was made to appear to them,and those who differ therein are full of Doubts,with no certain knowledge,but only conjecture to follow,for of a surety they killed him not, Nay, Allah raised him up unto Himself;And Allah is Exalted in Power,Wise.'[Qur'an 4;157-158,