Simply referencing Christianity isn't propaganda. Like it or not, it's a touchstone most everyone can relate to and so it gets used in plenty of plots, from sci-fi to horror. Would you call Kevin Smith's Dogma Christian propaganda because it references Christianity? Bruh. Actual God showed up there too. I don't get upset when religion is referenced, so long as it isn't used to beat me over the head with. I mean Marvel has a literal Norse god as a main character. Why would it be any different to have a Christian god as a main character?
Anyway, even if you map this movie 1:1 with Christian tradition it has nothing good to say about it. That is the opposite of propaganda.