Amusing assumption, but a bit ad hominem.
Many but not all Christians use
in their religion. Not all, there's good reason to not do so as justified in Gospel -- it appears that many pick & choose what they want from the Old Testament to the point of being self-contradictory, and Someone warned about misusing scripture as a justification for non-Christian behavior, a warning that gets sadly ignored.
For what it's worth, within the context of religion, creation myths and other religious silliness can serve as decent explanation of how things came to be in terms their contemporary audience would understand. Overly literal minds often take these things way, way, too far. Do I think, for example, that the entire world flooded? Not really, However, I bet there was a really big flood at the Black Sea that would certainly give the people around it the idea that the whole world was underwater -- for them, it was, as their whole world probably was a twenty mile radius from where they were born.
I highly doubt that early agrarians would have accepted or even been in a position of being able to comprehend stuff like evolution -- most didn't even have the benefit of a zero to keep them company. It doesn't take away from the theology or even their intelligence -- they just didn't have the benefit of the giants upon whose shoulders we stand upon.
Some things about religion do work. Don't assume that the people that believe in it are all living in caves, eating dirt and willfully ignoring all science in a vain attempt to achieve luddite nirvana.