I mean, female mannequins have nipples…

Not to mention it was profitable for the kingdom’s leaders. Tithe’s were built into the Christian religion and and many took kickbacks from the church for protection. That and things like “the meek shall inherent the earth” persuaded the peasantry to a certain content with being poor, which contributed to subduing uprisings. Not to mention the security that came with converting to Christianity. When kingdoms around you convert and are actively encouraged and supported to convert other pagans and attack if they resist, it starts to become a safer option for your people to just convert to avoid bloodshed.

I am surprised on the amount of false and half true responses to your question by what are clearly amateur historians or history enthusiasts. If I were you, I would try posting this in r/AskHistorians. They have more stringent requirements for comments that make sure the responses are detailed and cite credible sources.

This only applies to Southern European pagan religions. Many of the sites of worship in North and Western European pagan religion varies widely from region to region and tribe to tribe. Some could be located out in nature and open to all while others could be centered around a single “priest” or group of “priests” who interacted with people based on their own discretion. That being said we really don’t know for sure how most of them operated as almost all did not keep any records whatsoever.