There’s an entire section about religions being an amalgamation of thousand year old beliefs.

Here’s a section. Horus was an Egyptian god, born on dec 25th to the virgin Isis Mary, accompanied by a star in the east and adored by 3 kings. He was a prodigal child teacher at 12, baptized at 30, had 12 disciples, and performed miracles (healing sick, walking on water). After being betrayed by Tython (?), he was crucified, dead for 3 days and then resurrected.

There’s a lot more in there about positions of the stars and what not.

Edit: nvm, it’s about as real as the religion(s) it was mocking. Good story tho.