Because I believe it's useless. I know they mean well, but they all know I'm an atheist - it's no secret. I know someone praying for me doesn't *hurt* anything, but it sure doesn't help either. I guess I'd rather they do something practical to show their concern, like send me a care package (they've all had surgeries before and I never have, so I assume they'd know what little things I'll treasure afterward) or just take the time to talk with me about my fears, etc.
