The study comes with other significant caveats, too:
The same link might not be found for other types of religious beliefs that are perhaps more liberal, researchers say. And while the study reveals information about states as a whole, it doesn't shed light on whether an individual teen who is more religious will also be more likely to have a child.
"You can't talk about individuals, because you don't know what's producing the [teen birth] rate," said Amy Adamczyk, a sociologist at the City University of New York, who was not involved in the current study. "Are there just a couple of really precocious religious teenagers who are running around and getting pregnant and having all of these babies, but that's not the norm?"
Strayhorn agrees and says the study aimed to look at communities (or states) as a whole.
"It is possible that an anti-contraception attitude could be caused by religious cultures and that could exert its effect mainly on the non-religious individuals in the culture," Strayhorn told LiveScience. But, he added, "We don't know."