Christian?

He's descendant from Croatian immigrants (possibly refugees) who fled in large groups from Postwar Yugoslavia (communism and Tito) in the 50's to Australia, which would mean his father and or grandfather, depending on when they immigrated, would almost certainly be Christian, probably Catholic, since the majority of Croatians are Catholic while Muslims in the former Yugoslavia would have lived in a different section of the country. But there's no way to know if he personally carries those beliefs, and I don't claim to be an expert on Yugoslavia or its religious or political makeup in any way, so please don't take my word as gospel as I may be mistaken.