We live in a multicultural society. The secular media are having a field day with our intolerances and failings. We don't need to give them any more ammunition, while at the same time affirming our commitment to the unchanging Word of God, rather than the whims of a pagan culture. All institutions, said sociologist Robert Merton, are inherently degenerative. Institutions tend, over time, to increase in complexity and exclusiveness, multiplying laws, regulations, and constitutions.
Tradition is a good servant, but an oppressive master.
Let us state the issue in stark terms. Those who are members, however, may, despite their private morals, vote on all matters financial and theological. So may the adults who are factional, greedy or backbiters. However, if a godly Salvationist or Anglican were to request membership, they would be refused in most of our churches. Their spiritual life may be exemplary, but this matters less, apparently, than the quantity of H20 used in their baptism, and the chronology of that event.