Because, well, no offense, they're a little on the crazy side. And the Genesis stories are scientifically wrong. Creation is all in the wrong order. To believe them as literal truth is just to be wrong. At best, they must therefore be allegorical in nature.(Edited)
Chasing rabbit trails but...
From a Christian perspective, they are not crazy if you consider an all-powerful God who created the Earth and everything in it in 7 days. Even those miracles don't compare to the question of why Jesus would die for a wretch like me.
Also, popular scientific beliefs have, in the past been proven wrong, and will continue to be proven wrong in the future.
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