No one really disputes such common sense, until it is applied to religion. I've never seen or talked to a god, nor seen a god do anything unmistakably godlike. People insist they know one exists, but most of them really say they only feel it, and don't offer any other proof. Indeed, it is odd that those few who honestly offer the more genuine proof of actually hearing god talk are branded insane even by the believers. Feelings do not tell us much about reality outside of ourselves.
People also say that the bible says a god exists.
Since these all sound like tall tales to me, I think god is probably a tall tale, too. Likewise, the bible may say a god exists, but I still won't believe it until I see one myself. Most people I meet, however, don't realize that I am first and foremost a freethinker, and only an atheist as a result of applying freethought to the evidence available to me. The reasons I have for being a freethinker are actually rather different from the reasons I have for not believing in a god. This has sometimes triggered interesting conversations about why I am a freethinker.