All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Whoever believes that the Prophet Muhammad was not the last Prophet, then he goes out of the fold of Islam and becomes a non-Muslim. Also, if a person denies the descent of ‘Eesa (Jesus) (before the Day of Judgment) after the proof is established against him, and he follows other than the path of the believers, then he goes out of the fold of Islam and becomes a non-Muslim.
Allah Says (what means): {And whoever opposes the messenger after guidance has become clear to him and follows other than the way of the believers –we will give him what he has taken and drive him into Hell, and evil it is as a destination.} [Quran 4:115]
Allah knows best.