It’s not “mom and dad” that they are in rebellion to, even if they think that’s the case.
So, they're rebelling against G-d? They don't have any trouble respecting moslems' belief in G-d (or even Black Protestants' and Hispanic Catholics' belief in G-d), do they? In fact, I'd say that lefty atheists actually prefer Black and Hispanic chrstians to just about any other group.