The familiar answer from liberal mainline Christians is to protest that church attendance and religiosity is on the decline across-the-board, not just in denominations that embrace homosexuality. But this excuse fails to account for conservative denominations like the Assemblies of God, which has been consistently and rapidly growing for more than 40 years. Despite much of the hand-wringing over the Catholic Church’s highly visible public advocacy against gay marriage, it has been consistently growing in the United States. Lord knows the Mormons haven’t had any trouble growing. Even theologically conservative denominations that are declining, such as the Southern Baptist Convention, began declining much later and much less drastically than other denominations. The Southern Baptist Convention has only declined by 3 percent since its peak in 2007—an average of less than 1 percent annually—and has actually been adding congregations.
In the end, Christian supporters of gay marriage will likely view its effects on church membership as a side issue. Christians have a responsibility to grow their churches, but also a responsibility to promote what they believe is just in God’s eyes. But for some strange reason, it seems like conservative Christians never have to sacrifice one responsibility to fulfill the other.