What do atheists/agnostics have to lose if they're wrong? Nothing? If I'm wrong, I will have still lived my life the way I wanted to, and made the most of it for myself.
Even if it's not the consequence of Christianity, but of some other belief system? Wouldn't it make most "logical sense" to at least commit oneself on to some belief? Say Christians and atheists are both wrong--wouldn't that still make the Christian more rational by believing in at least Something Unknown? Well, this is where it depends on your viewpoint I suppose. My mind sees it as illogical that there is "Something Unknown", and as a result....it is completely illogical to me to join a belief system. That would only restrict my ability to do as I want in the limited time I have available to me in the one life I get, through it's rules and time required to participate in said religion.