Is it permissible to pray behind someone who deals with jinn and believes there are saints who manage the universe?

The ruling on dealing with jinn varies. If it is established that the man believes the saints manage the universe and can benefit or harm, either with Allah or independently of Him, then he has fallen into major shirk, which expels one from the fold of Islam. Prayer behind him is not permissible, and the mosque community must isolate him and arrange for another imam.