Why do you assume that the homosexual trying to join the group isn't like minded? Why is it so hard to believe that the homosexual could be a Christian? or a conservative?
The point is that the criteria they are claiming is that they don't allow members who are guilty of sin. So how do they vet and keep tabs on their members to make sure that they are not sinning in any way? If the the only criteria for rejection is homosexuality, then that's a problem. What opportunity do the homosexuals have to join Christian groups? The Christian groups are rejecting them. Should they have to start their own group? Seperate but equal didn't work in the past, and it doesn't work now.