He was a man of his time, who had the viewpoint of men of his time. In fact he was more enlightened than most.
For example Darwin was a vehement opponent of negro slavery. Guess who he had enraged arguments about this subject with... Captain Fitzroy, the Christian Fundamentalist Captain of the Beagle, who justified slavery on Biblical authority (just as he rejected evolution on Biblical Authority). Their arguments on the subject were so furious that Darwin nearly left the Beagle in Argentina.
For example Darwin was a vehement opponent of negro slavery. Guess who he had enraged arguments about this subject with... Captain Fitzroy, the Christian Fundamentalist Captain of the Beagle, who justified slavery on Biblical authority (just as he rejected evolution on Biblical Authority).
It was largely through the efforts of Wm. Wilberforce, a committed Christian, that the slave trade was abolished in England.