Other religious groups said they were waiting to see the revised policy before making a decision to stay or go.
Asked Tuesday for a comment about the alternative group being formed, Boy Scouts spokesman Deron Smith said, “It would be inappropriate for us to discuss other organizations. We remain focused on reaching and serving youth in order to help them grow into good, strong citizens.”
Mr. Stemberger and Mr. Green said they did not know how big “the exodus” from the Boy Scouts would be or how many people would join their organization, which will be unveiled, with a name, logo and other details, at its first national convention in Nashville, Tenn., on Sept. 6 and 7.
However, “we have heard from over 30,000 families,” Mr. Green said.
The group will be open to boys of all religions, races, nationalities and ethnicities and will be modeled on American Heritage Girls, a religion-based alternative to the Girl Scouts of America.
By November, the organization will be accepting registrations for new units as well as Boy Scout units that want to transfer. Rank advancements earned within the Boy Scouts will be transferable, Mr. Green said.
Groups such as Faith Based Boys, TrailHead USA and Frontier Service Corps are part of the coalition that attended a confidential planning meeting at the end of June in Louisville, Ky.
The organization should be in full operation by Jan. 1.