Is it permissible to pray behind one who insults the religion?

Question:
What is the ruling on one who insults the religion? And is it permissible to pray behind him? May Allah reward you with good.

Answer:
One who insults the religion is a disbeliever, or one who insults Allah and His Messenger is a disbeliever. He is to be given the opportunity to repent; if he repents, well and good, otherwise he is to be killed. It is not permissible to pray behind him. Rather, it is obligatory that he be given the opportunity to repent; if he repents, well and good, otherwise he is to be killed. As for insulting Allah and His Messenger, the scholars hold that he is to be killed and not given the opportunity to repent. We ask Allah for safety. The conclusion is that insulting the religion, insulting Allah, and insulting the Messenger—all of this is disbelief and misguidance. It is major disbelief. We ask Allah for safety. As for whether he is to be given the opportunity to repent or not, the place for this consideration is the Shari'ah courts. Yes.