What does 50/50 have to do with anything? We already know that the theistic crowd outnumbers the antitheistic/atheistic in America. Question, based on your WAG, was which side was more likely to jump down the other's throat. I'd wager the latter group would make a much bigger noise if the situation were reversed as a % of it's size. Even if only 10 out of 100, I'm sure more of those 10 as a % than of the 90 as a % would make a bigger stink. Minority groups may be smaller in size, but many of them are much more vocal than majority groups.
Now, I want you to remember that no bastard ever won a war by dying for his country. He won it by making the other poor, dumb bastard die for his country.---Patton
There is no room in this country for hyphenated Americanism.---Teddy Roosevelt
I never forget a face, but in your case I'll make an exception.---Groucho
And if you all get killed, I'll piss on your graves.---Shaman Urdnot
How would you like to own a little bit of my foot in your ass.---Red Foreman