Those metas are brilliant. I'll admit, my original view of Steve was strongly colored by Ultimates and my personal bias towards the modern focus of Catholicism/Christianity. Whedon didn't help with the "There's only one god, ma'am" line. Both authors did a good job of of summarizing/explaining the personality that makes the most sense for Steve and put some great context to the time/place he would have grown up in, and I think that's all consistent with his MCU characterization.

I've always seen Tony as fiscally conservative, but there's always been the expectation that he's a dick like that (and in other ways). I don't think he's socially conservative though, although he probably doesn't have enough emotional effort to care about social issues, he just assumes it'll all work out. He's definitely not pro-life or Bible thumping.

I do think Pepper is probably a bit more liberal/cares more. Honestly, though, of all the differences between them, that's sort of the smallest one.