PS: You guys give insightful answers, but read carefully so I can explain. I don't identify with any of this ideologies I am only a researcher who is trying to figure society.
First, I am not a follower of the Protestant religion, much less know its tenants. However, I was reading on Purity culture and it seems to me that it shares many of the same ideas that MGTOW, Redpill and the other manosphee movements have.
Purity Culture: Women who post bikini pictures are sinful. Purity Culture: You should not marriage, a women who does that.
MGTOW/Redpill: Modern women today are sinful, they have Onlyfans. MGTOW/Redpill: Men cannot marry in this modern culture, we should go our own way..etc


I've known a lot of people in both circles, and though their delusions manifest in similar ways, they're very different.
MGTOW are often militant atheists, feeling as put down by religion as they are from women. Most of them talk like they've given up on meaning in life. Purity Culture just expects people to dress modestly, and not kiss or masturbate. Then when you get married, magically flip a switch and be able to satisfy one another completely.