We have seen him pray to Allah 5 time a day. Kneeling towards Mecca with beads and taqiya. Mr. Vaziri is a Muslim. You're probably wondering because you overheard him saying "thank god!" and/or "i believe that deserves another Thank God".
....muslims as the rest of the world's different religious people uses the word "God" as a referance to the person they believe to be their leader, lord, creator etc....So "God" can refer to both Jesus Christ, his father and the holy spirit or it can refer to Allah (or Buddha, Jehovah, Yahweh, Adonai, Ahura Mazda etc...)