How old did he think the earth was?
Did he believe in the literal interpretation of Genesis?
If he believed Genesis, then he should have followed through and acted consistently with those beliefs. Consistent application of biblical beliefs involves self-sacrifice, love and concern for your neighbor. We are accountable to God for all that we do and will be judged accordingly.
Consistent application of Darwinism involves shooting your neighbor, impregnating his wife and seizing his property.
Ideas have consequences.