Just as our Lord speaks in parables, which aren't intended as factual histories of prodigal sons and foolish virgins, the Old Testament may sometimes speak in figurative stories that aren' t to be interpreted literally. A rational man may even reject both religion and Darwinism as unsatisfactory accounts of human origins. But Darwinism serves the purposes of those who want to discredit Christianity and impose secular humanism as an official quasi-religion. That's why so many liberals who know little of science want evolution shoved down kids' throats, no matter what their parents want. The issue is not just science versus religion, but the state versus the family.
Teaching evolution helps train children to be on the side of the state.
The materialist view of man's origin also serves the state. If man is only a refined ape, there is nothing precious about the individual. Racists and Marxists alike embrace Darwinism and conclude that the state needn't be inhibited by metaphysical notions of individual rights or universal justice. Liberals contend that the Nazis abused the theory of evolution to declare some races subhuman. That's basically the same inference liberals draw about unborn human beings, whose killing is warranted by the fact that they are in an early stage of development.