I don't know how someone could be a Boy Scout for more than a week and not realize that it's a Christian-based organization. The group was founded with it's first national office in the YMCA building in NYC (Young Men's Christian Association, a firmly Protestant organization), "reverent" is part of the Scout Law, and Article III of the BSA Constitution states quite plainly, "Boy Scouts of America believes that no member can grow into the best kind of citizen without recognizing an obligation to God." Part of the Scout Oath and the Scout Law is to be morally straight and be clean in thought, word, and deed.
Scout Oath
On my honor, I will do my best
To do my duty to God and my country and
To obey the Scout Law;
To help other people at all times;
To keep myself physically strong, mentally awake and morally straight
When you become a Boy Scout you take the above oath. The oath has meaning, every line of it.
Scout Law
A Scout is trustworthy, loyal, helpful, friendly, courteous, kind, obedient, cheerful, thrifty, brave, clean, and reverent.
Duty to God, morally straight, reverent. These are not secular things.
Of the Top 10 sponsoring Chartered Organizations associated with the BSA, 6 of them are religious organizations (Church of Christ of Latter Day Saints, United Methodist Church, Catholic Church, Presbyterian Church, Lutheran Church, and the Baptist Church), and the others are the PTA, other parent-teacher groups, and private school almost all of which are religious-based private schools. The Church of Christ of Latter Day Saints was the first sponsor of the BSA and still today is it's largest supporter and contributor. The United Methodist Church is a close second in terms of support and contributions.
No, they're not afraid of "gays" didling the boys. They're afraid that "gays" cannot, by definition or by deed, live up to the Scout Oath of being morally straight and clean in thought and deed.
The Boy Scouts, like all private organizations, have the constitutionally protected right under the First Amendment of freedom of association to set membership standards. What's a gay to do? Not be a Boy Scout, that's what.
Maybe they could start a Gay BSA. They'll probably have spiffier uniforms, kinda like the regular BSA uniforms, but with ski boots and a kicky beret.