Marvelous satire of religion and its followers - how the message is distorted, how factions invariably form and fight one another, and how blind worship quickly replaces reason (and even kindness). After the Sermon on the Mount is delivered to a crowd who mostly can't hear Jesus and squabble among themselves, one guy walks off commenting "What Jesus fails to appreciate is that it's the meek who are the problem," in shades of the conservative view in 1979 and today. Mostly it's just good, sacrilegious fun, sometimes venturing into territory that's now frowned upon (like making fun of a speech impediment), but overall very creative and intelligent. Here's another funny bit:
Brian: Look, you've got it all wrong! You don't need to follow me! You don't need to follow anybody! You've got to think for yourselves! You're all individuals! Crowd, as one: Yes! We're all individuals! Brian: You're all different! Crowd, as one: Yes, we're all different!
Brian: Look, you've got it all wrong! You don't need to follow me! You don't need to follow anybody! You've got to think for yourselves! You're all individuals! Crowd, as one: Yes! We're all individuals! Brian: You're all different! Crowd, as one: Yes, we're all different!