In an interview several years ago, Sfar said:
“My rabbi is not a modern guy. He’s very old-fashioned. He’s not an intellectual—his relationship with religion is very down-to-earth. He doesn’t really care about God’s existence. He just cares about what he has to do every day. I like the idea of his coming back from Paris and saying that he doesn’t know if there’s a God or not, and then he goes to pray. Many people forget about this relationship to religion as a daily practice. But I’ve always preferred the sayings of my grandma to the dictates of my grand rabbin.”I hope to see Sfar's new documentary on French singer Serge Gainsbourg, whom I've heard of but never have known anything about.
Update: New York Times review of the film is here.