It has been a wrenching season for three of America's largest religious denominations, as sex-abuse scandals and a schism over LGBT inclusion fuel anguish and anger within the Roman Catholic, Southern Baptist and United Methodist churches. There's rising concern that the crises will boost the ranks of young people disillusioned by organized religion.

"Every denomination is tremendously worried about retaining or attracting young people," said Stephen Schneck, a political science professor at Catholic University. "The sex-abuse scandals will have a spillover effect on attitudes toward religion...