It is even more than that. A lot of kids favor other activities such as athletics or clubs which require plenty of commitment, such as sports of honor society, which takes time and were programs which I saw plenty of children drop out of scouting for commitment to those programs instead. Another issue has been the growing percentage of children not in traditional families, mostly with a single unwed parent, who are far less likely to join scouting. Finally, religion is down in America with plenty of young adults not belonging to any religion at all, with the BSA having prayers and all, why bother sending your kids to a mostly religious group? Some exceptions like my father are out there, but overall, it will bring scouting down.
The UMC does not shove it in your face. And the PCA and SBC sponsored troops have bolted from BSA since 5/23/2013.
I agree that todays young families may well percieve that religion is going to be forced in their faces, but that was, for the most part, not my experience.