By contrast, I was recently watching ST2:TWOK with my wife, who incidentally is an ordained Christian minister. She actually burst out laughing at Spock's funeral when Scotty started playing "Amazing Grace", a specifically Christian hymn. Spock is an alien, she notes, and probably wouldn't be a believer in any specific human religion. (Yes, he's half human but he mostly rejects the human side of his heritage.)
Spock does seem to have an interest in Christianity, in TUC he has a painting in his quarters depicting Adam and Eve's expulsion from Eden. And back in TOS he used the Bible quote about the lilies in the field in comparison to the Tribbles. And in The Way to Eden he comments on the irony of someone named Adam eating forbidden fruit.