Logically, it would stand to reason that if atheism was somehow more rational and logical than belief, man would have started out being atheist.
If you want to claim you’re “doin logic and reason” then you need to do better than that attempt.
(1) The contest isn’t between atheism and all beliefs. It’s specifically between atheism (no belief in invisible, magical, supernatural, paranormal, untestable, unfalsifiable gods), and theism (belief in invisible, magical, supernatural, paranormal, untestable, unfalsifiable gods). Essentially no different than a contest between no belief in invisible, magical, flying, fire breathing dragons, and belief in invisible,magical, flying, fire breathing dragons (can you spot the winner?).
(2) Atheism isn’t the product of rational and logical belief as you imply. It’s merely no belief in invisible, magical, supernatural, paranormal, untestable, unfalsifiable gods. A very rational and logical position to any rational and logical mind.
(3) The reason everyone starts out being atheistic is because they start out without knowledge of god claims and the ability to assess them (even if they somehow did have such knowledge). To argue that people have to know about god claims and have the ability to assess them to quality as being labeled atheists, doesn’t change the fact that during the assessment period (however brief) they are atheists. People don't believe in invisible, magical, supernatural, paranormal, untestable, unfalsifiable gods until they do.
(4) (P C nitpick) These days, "humans" is more appropriate than "man".