In other words, yes, you're saying support for marriage, religious liberty, policies that enable and strengthen families and that protect unborn children is partisan politics. If the Dems weren't pro Sodom, they would probably have garnered some SBC votes, but then, if the Dems weren't pro Sodom, they would be Republicans.
As long as Republican policies are pro-life, pro-religious liberty, pro-family and pro marriage, they will get the believers' votes. That's not partisan politics, that's Christianity.