It would be an interesting factoid to know many Scouts are not mormon in mormon run troop/packs.
There are a couple of LDS troops in my town. My understanding is that non-LDS boys are encouraged to join other troops, not the LDS troops. When summer camp rolls around, the LDS troops council-wide rig it so that only LDS troops are present for their one week of the camp.
Still, BSA is a good program for most any boy. My 11-year-old is loving it. I wish that it were as popular now as it was when I was a Scout.