No thanks, I wouldn't mind being in a party full of Christians as long as their measures were the best possible. I don't think being in an atheist exclusive party would be better for me, in fact I tend to disagree with a lot of political ideas other atheists have.
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you