I've long maintained that if we were to forget the Bible, the Koran, the Upanishads - forget Moses and Jesus and Mohammed and Krishna, the Buddha and the Bodhi Tree - it would not matter in the long run. There would always be a story. If we didn't remember one, we would make one up.
Here's one we made up long, long ago. If it hadn't been for the penchant of Mithraism for secrecy, not to mention its exclusion of women, we might be erecting tauroctonys in our places of worship in place of madonnas, minarets, and mandirs.
Then again, since I took this picture of Mithras slaying the sacred bull in the Vatican Museums, perhaps we have forgotten nothing.