Do you really want to turn into the very same purity-spiraling nonsense as the Intersectional crowd? Where being out of line on any one thing is cause to be thrown out entirely? Do you seriously want to just flip the table on Pit Politics that are giving the Republicans their first breath of fresh air in decades because you can't stand that the United States never was an explicitly Christian nation?
One of the first things the Federal government did was assume power over what a valid marriage was, because the varied denominations sequestered in the colonies refused to recognize eachother. This is also why Freedom of Religion is in the Bill of Rights, because quite simply the "good Christians" of the time were split between denominations that had literally waged wars against eachother and led to states refusing to accept marriages conducted by other denominations in other states.
There is no one "true" Christianity anymore, and the founding laws of the nation specifically demand the exclusion of such. Because they needed only look a mere few decades back to see active warfare over such things. Do not try to cast LGB into a pit. This space exists entirely because of us being on the receiving end of such ideological hegemonizing, and the Bill of Rights specifically tries to disallow such being public policy for very good reason.
US conservatism is founded on a secular practice. The ethics are founded in Christianity, but could not be tied to it because there wasn't a usable definition of "Christian" at the time without defeating many of the points by establishing Catholicism or spinning off the Anglican Church. It was only with the "Moral Majority" phase of the Republican machines that "Christian" actually became a determinant in the US. Bitter shitflinging between Protestants and Catholics is still in living memory in the US, as we have seen on this very board.
Before that push for big-tenting religious views, people considered their denomination quite important and regularly argued over the details that separated them, leading to "Christians" being utterly politically irrelevant for decades. If you want to go back to that by pushing for adherence to doctrine that is already quite spotty with trying to backtrack to the Stonewall days, then have fun rapidly returning to the sectarian pit responsible for the feds being able to tell you to fuck right off on marriage.
This has nothing to do with religion or purity circles though? What most of us are saying is simply that catering to 10% of 2.7% at the expense of 13% and 37% and 5% is, purely from a political perspective suicide.
America's changing demographics won't actually lead to a prog shithole, it'll lead to something just as bad and with similar trappings if there is a dedicated and aggressive attempt to force assimilation but one thing most of us immigrants have is a natural dislike of the alphabet soup.
Some of us are fine with the LG and B but most hate all of them all the time and if you want to get their vote showing weakness is not how you do it.
From a cynical perspective its just suicide