Pagan Origins of the Christ Myth
Another Sacred Penis for your Mother-in-law moment
The ancient world was incomprehensibly different from ours. It's hard to remember how different.  This helps:  
For women followers of the Goddess Cybele, having sex with a stranger was a holy sacrament. Go figure.
The Romans would go to the mixed- sex public baths completely naked.
For women followers of the Goddess Cybele, having sex with a stranger at the temple was a religious act—a sacrament!
And, get this, you read in the ancient texts about a man, a follower of Dionysus, dedicating a sacred penis to his mother-in-law! Go figure.

You can't figure. I doesn't make sense—to us. It did make sense to the ancients. That's the point. Ancient culture was different from ours in ways we would never predict and can't understand. Keep that in mind while we talk about ancient religion.

But you should also understand that not only was ancient culture different from ours, the way it was different was different from what your modern ideas make you think. For example, you're maybe thinking all this sex stuff I just listed was that way because the ancients were wild uninhibited filthy minded dirty people. They weren't. In marriage chastity was not just a virtue, it was the expectation. Many Roman baths separated men from women. Non-believing Roman writers found the Cybele sex business repulsive. The sex stuff on the list wasn't about sex, it was about the sacred miracle of new life.

Boner-Gods ("ithy-phallic" Gods, if you're supping with the Queen. Or maybe just chat about the weather. Also, remember not to pick your nose.)

The ancients didn't make statues of boner-Gods to worship sex. Then as now, people didn't need statues for that.

The ancients made statues of boner-Gods as a way of worshiping the sacred miracle of new life.

 

Diodorus of Sicily explains

 
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They [the Egyptians] have deified the goat, just as the Greeks are said to have honored Priapus, because of the generative member; for this animal has a very great propensity for copulation, and it is fitting that honor be shown to that member of the body which is the cause of generation, being, as it were, the primal author of all animal life. And, in general, not only the Egyptians but not a few other peoples as well have in the rites they observe treated the male member as sacred, on the ground that it is the cause of the generation of all creatures; and the priests in Egypt who have inherited their priestly offices from their fathers are initiated first into the mysteries of this god. And both the Pans and the Satyrs, they say, are worshipped by men for the same reason; and this is why most peoples set up in their sacred places statues of them showing the phallus erect and resembling a goat's in nature, since according to tradition this animal is most efficient in copulation; consequently, by representing these creatures in such fashion, the dedicants are returning thanks to them for their own numerous offspring.
[Diodorus of Sicily, Library of History, 1.88 (1st century BC),—which you can find in: Oldfather, C. H.. Diodorus of Sicily, The Library of History, Books I - ii.34 (Loeb Classical Library #279) (1933 /1998), pg. 299]

Don't believe me, believe the ancients themselves.

A few ways ancient culture was different from ours:
Demons