http://www.returnofkings.com/127379/3-reasons-why-christian-parents-are-raising-slutty-girls-and-beta-males

The three reasons suggested by the article, summarized:

  1. Biblical monogamy is misinterpreted. Here "monogamy" just means marriage. Nominally Christian households often suffer from the inversion of the husband and wife's roles. (This is written about extensively by Dalrock, in the "Attacking headship" category.)

  2. Forgiveness excuses promiscuity. "What shall we say then? Shall we continue in sin, that grace may abound? God forbid!"

  3. Christians praise beta behavior. I daresay that everyone subscribed to this subreddit have witnessed this. Blue Pill churches teach boys to be weak an ineffectual when dealing with women.

While this article by a former Anglican isn't particularly long or in-depth, I found it worth a read.