2000 years ago the nations that have generated what is now 'Western culture' were part of the Roman Empire. This was a society in which human sacrifice was known, and the abandonment of unwanted children, for whatever reason the father had, was standard practice. Gladiator shows saw men killing each other for the entertainment of the crowds, and crucifixion was the punishment for serious criminals.
All these features of the culture changed - not spontaneously but because Christianity came to dominate the moral discourse, challenged these behaviours, and Emperors stopped them. Religion is part of 'culture'...