I think, with others like Captain America, that he's not truly a stereotype when it comes to anything Christian. Believing that there's a God doesn't mean one does all the other actions associated with Christian behavior.
A
s said earlier, I'm always shocked how many champion for the man and yet ignore how he has had a long history of showing anti-mutant behavioral tendencies when it comes to his patriosm....supporting the "good" mutants but not challenging governmental policies that harm them since he has supported locking them up on many occasions as if they were guilty whenever a problem arose.
And you never see him explictly doing any real fighting in the name of God -
his religion is more so like the U.S. where it seems to be Deism in the same way the Founding Fathers had a patriotic Deism. And how often did you see Steve go out of the way to address other issues in his time like racism or the Holocaust explictly?
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That said, I do think the character is still one of the most amazing characters ever...with a lot of powerful themes centering around who he is (including the Civil War arc when it came to government resistance to being signed up/registered rather than protecting the principle of privacy)...
It was powerful when seeing how Steve Rogers - imperfect as he is - saw the
Superhero Registration Act (as a stand in for the Patriot Act) taking away due process, taking away Fourth Amendment rights, taking away a citizens right of who to associate with; all these and more, drove Captain America to oppose his government.
And there have been other things which I am glad Captain America has stood against as well...
And yet nonetheless, he is human enough to make mistakes/do things which make you wonder "Contradiction" - like his willingness to do torture ...letting others do it, of course, while he condemns it...

And due to the fact that he has grown up indoctrinated into the American ideal at multiple points, his humanity in not always seeing what's wrong is what makes him fascinating....