Darwin did not reject the Bible entirely.
"Darwin was quite orthodox and would quote the Bible as an authority on morality"
His scientific work has been used in the past by Eugenists to support biased ideas. His theory, because that's all it is in science, has many flaws (irreducible complexity). Sadly, science is used as a pseudo-religion, especially online, maybe to due to the lack of spirituality or group/community zeitgeist/sense.