I'd be really surprised if TRP weren't overwhelmingly christian. Like it or not, atheists are far more likely to be on board with feminism, secularism, what have you. Saying that TRP is atheistic seems extremely misleading to me; dogmatically "darwinian" as it might seem. I'm struggling to understand how you're putting a wedge between conservatism and TRP, when they seem to be more or less the same thing, albeit the weird darwinian overlay to one side.
People like to conflate reddit-style back-patting atheists with MRAs, but the overlap is really due to a confounding factor: They're all boys without much education who nevertheless have "being smart" as a part of their ego identity. They love the idea of knowledge that contradicts what most people believe: If they can know some factoid that most people get wrong, they think this means they're intelligent. Oh well. I'll go back to reading Onfray.
I didn't realize the "atheists-are-jerks" meme extended all the way to conflating atheists with MRAs. Atheism and feminism are (often) tangled up in one another. A wonderful source of misogynistic justification is to be found in any holy book you wish to point to. Atheism usually throws this out, along with feminism, and to some extent this sympathy is very strong. I suppose you could imagine a darwinian atheist believing that women have biologically enforced traits that make them somehow "lessers" to men, but I can't think of anyone, ever that has expressed this idea in the modern era (some 20th century authors having a derogatory view of women aside; this was "normal" from any ideological perspective at that time.)
You haven't noticed the evolutionary psych reasons MRAs give for their misogyny. I do not want to do that research for you because gross. Edit: This question -- are misogynist trolls atheists or Christians? -- is an interesting one. Misogyny is cooked into many religions, but unfortunately, the ethos some people take out of "survival of the fittest" isn't always awesome, either. I looked at Elliot Rodger's manifesto (again, gross), and he definitely is not coming from a Christian place. According to him, he, Elliot Rodger, is an angry God (ahhh, mental illness...), and women are animals. He uses the word "species" at one point, but there's no clear indication that he thinks Charles Darwin wanted him to do it.
I mean. Ok? You're talking about a bunch of christians, but you're saying they're terribly unchristian. They might be unchristian to you, but they would call themselves christian.
So, at much personal expense, I looked into the matter, and I think that you're incorrect. TRP's are at the very least as christian as the average american, and probably far more so considering the age group that the TRP is constituted of. There is virtually no scientific data to turn to, but I spent an, absolutely agonizing, length of time looking over "atheism", "christianity", and "religion" within the context of this sub-group, and found a very strong inclination toward christianity. Overtly atheist comments/posts were dramatically downvoted with notable frequency (although the fact that they exist does suggest that atheism exists within TRP culture) and I think you're committing a common mistake: you don't like reddit-know-it-all atheists, you don't like TRP, ergo TRP is atheist.
Here's a single example from "RooshV's" forum, but if you're not convinced I challenge you to take up your own analysis of the subject and see if you aren't forced to the same conclusion. Again, compared to contemporary teenage/20-somethings the inclination toward christianity is stronger than it should be. http://www.rooshvforum.com/thread-41509.html Also, it should be stated with great emphasis that the state's rights movement in the United States, with all that brings along with it, is a deeply conservative, deeply religious movement. It grew out of the white supremacist movement that was also incredibly conservative and incredibly religious, and about the only group that ever took eugenics seriously. Timothy McVeigh to Dylann Roof, this has been a conservative, religious phenomena, and by no means associated with atheism.