I'm an atheist, but I've never been fond of this argument or thought of it as making much of a point. On the other hand, just as there are many types of atheists (the ones who oppose religion absolutely; those who don't believe in god, but don't really care that others do, etc), there are many types of christians. And at least one type is the bible literalists (I live in the US south, btw). And, the value of PI actually becomes relevant in these arguments (well, if there's rounding, then it's not all that literal, is it? etc..) So this is all very context dependent.