The dialog between atheists and believers often goes this way.
Atheist: Religion causes great harm. For centuries, Christians burnt witches and heretics at the stake, and killed Jews by the million. Hitler’s ideology was based on centuries of Christian antisemitism. Even to this day, they spread hatred towards homosexuals based on their beliefs not based in any reality.
Christian: But those people were not true Christians! How can a true follower of Christ spread hatred instead of love and condemn instead of forgiving?
Atheist: You commit a common reasoning fallacy. It even has a name. It’s called “No True Scotsman Fallacy”. You can read about it on Wikipedia.
Atheist: But how is this related to atheism? How can lack of belief cause such things? It only takes religion to commit such atrocities. In fact, the Soviet regime had many attributes of religion. Communists were not true atheists.
Christian: Aren’t you using the same ‘No True Scotsman’ fallacy?
Atheist: No, this is not a true ‘No True Scotsman’ fallacy. My reasoning is completely different.
Prompted by Daily Prompt: Groupthink
Inspired by “True” Christians