BTW, I've played in & even ref’d in those interdenominational leagues. They're a hoot.
Christians have killed Christians, Mormons have killed Mormons, Christians have killed Mormon, Mormons have killed Christians.
All of these things reek of the stench of the evil one... We had a couple of LDS teams in a league down on the coast many years ago when I lived there. (yes in the South) good players all. We shook hands and hugged after and shared a fine meal each week.
It is not about the people, it is about the beliefs, the ISMS.