Here's a study that found "Increased religiosity in residents of states in the U.S. strongly predicted a higher teen birth rate.... With data aggregated at the state level, conservative religious beliefs strongly predict U.S. teen birth rates, in a relationship that does not appear to be the result of confounding by income or abortion rates. One possible explanation for this relationship is that teens in more religious communities may be less likely to use contraception."

https://reproductive-health-journal.biomedcentral.com/articl...