Catholicism has been in general against contraception. Of course it's still used, but probably at lower rates. Non protected sex leads to pregnancy at a much higher rate than protected one. I expect it to be similar for other similar religions. Bodycount is also irrelevant, the total numer of intercourses is what matters. I'm not sure if having a stable partner since a young age leads to more total intercourses than occasional partners, but I'd be lead to thing so.

https://en.m.wikipedia.org/wiki/Religion_and_birth_control#:....