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The Holocaust is a religion all people are inducted into without their knowledge, it has it's priests and tithes and Original Sin- Importantly there is no evidence Adolf Hitler sponsored or embarked upon a genocidal mass murder project along racial lines.
Your definition of religion is vague and your claim of historical revisionism is without merit. It is necessarily the case the evidence for a historical event will become less compelling as time passes and primary sources should be considered the best account of what happened.