According to at least one prominent Republican, the answer is very definitely not:
Yesterday, in response to one of the many brouhahas that CPAC seems always to invite, Brent Bozell issued the following statement:
The invitation extended by the ACU, Al Cardenas and CPAC to American Atheists to have a booth is more than an attack on conservative principles. It is an attack on God Himself. American Atheists is an organization devoted to the hatred of God. How on earth could CPAC, or the ACU and its board of directors, and Al Cardenas condone such an atrocity?
The particular merits of the American Atheists group to one side, this is a rather astounding thing for Bozell to have said. In just 63 words, he confuses disbelief in God for “hatred” for God — a mistake that not only begs the question but is inherently absurd (one cannot very well hate what one does not believe is there); he condemns an entire conference on the basis of one participant — not a good look for a struggling movement, I’m afraid; and, most alarmingly perhaps, he insinuates that one cannot simultaneously be a conservative and an atheist. I reject this idea — and with force.
If atheism and conservatism are incompatible, then I am not a conservative. And nor, I am given to understand, are George Will, Charles Krauthammer, Anthony Daniels, Walter Olson, Heather Mac Donald, James Taranto, Allahpundit, or S. E. Cupp. There is no getting around this — no splitting the difference: I don’t believe there is a God. It’s not that I’m “not sure” or that I haven’t ever bothered to think about it; it’s that I actively think there isn’t a God — much as I think there are no fairies or unicorns or elves. The degree to which I’m confident in this view works on a scale, certainly: I’m much surer, for example, that the claims of particular religions are untrue and that there is no power intervening in the affairs of man than I am that there was no prime mover of any sort. But, when it comes down to it, I don’t believe in any of those propositions. Am I to be excommunicated from the Right?