Question: I have never heard Atenism. Is it made up?

No. The reality of Atenism can be found in the ancient records of the Middle Kingdom of Egypt. Orthodox Atenism is this same religion in the modern day. All its material, that is not the stuff of ancient records is either produced by, and sanctioned by Akhnaten Himself. Meaning Atenism is as far away from being fabricated as you can get.

Simply put: No other religion in existence can claim to be governed by the exact same person who established that religion - except Orthodox Atenism.