I agree with your general point, although I deliberately used the example of "Young Earth Creationism" because it runs afoul not only of biology, but also geology and nuclear physics and astronomy. But you're absolutely correct that "atheistic evolution" and "Genesis literalism" are not the only two options available. (There are theistic cosmologies from many other religions, and there are various forms of "theistic evolution" arguing that the God of Abraham -- or some other Supreme Being -- in some way or another designed and supervised the evolutionary development of life over billions of years.)