Yes, I read a book, Fossilized Customs, years ago…many human traditions never the same.
I don't agree with all every single concept purported…its a good start though. Constantine brought pagan(occult) traditions and gave them a supposedly "Christian" flavor, including changing the weekly holy day sanctified by God Almighty to the day of the "Sun" and adding worship/prayer to a female "deity"/goddess.
These people are SICK (video related).