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Approximately 1 billion babies have been murdered in the womb due to secular atheism/humanism over the last century.
Stalin – an alleged atheist – killed over 43 million Russians and Ukrainians. Including Stalin approximately 110 million people were killed by communists over the last century. Over 2000 years approximately 4 million people have been killed in Christian related conflicts or wars.
See e.g.
http://www.hawaii.edu/powerkills/COM.ART.HTM