I know it's obnoxious to quote yourself, but back in 2013 I wrote a post warning that this sort of thing was about to happen. In fact, I'm surprised it took five years. Here's what I wrote at the time:
However, if SCOTUS decides to "Roe" the nation on gay "marriage" and impose it on the nation via judicial fiat, one of the most immediate effects of such a ruling would be to require a de facto religious test for many public offices. Because the ramifications of a SCOTUS pro-gay "marriage" ruling would be to define those who don't accept gay "marriage" as bigots and any anti-gay "marriage" position as bigotry, the Supreme Court would essentially open the door for a prohibition against "bigots" holding many public offices. This would mean that the only Catholics who would qualify for public office would be the heretical ones who dissent against Church teaching against gay "marriage," while faithful Catholics who accept all Church teaching would be barred--officially or unofficially--from serving in many branches of the government. An immediate example that comes to mind is that of chaplains serving in the United States Armed Forces: will they be required to officiate at gay "weddings" or to otherwise violate Church teaching, or will the government simply decide that "bigots" don't get chaplains anymore? I fully expect that to be one of the early battlegrounds.
If the Supreme Court decides that opposition to homosexual acts and opposing the pretense of two-man or two-women "marriage" is the same thing as racism, then no quarter will be given to any religious citizen whose deeply held religious beliefs oppose gay "marriage." Whatever is done to Catholics and the Catholic Church in a post-gay "marriage" America will be the template for the eradication of religious beliefs that call homosexual activity sinful on the grounds that to hold such beliefs makes one an evil bigot who cannot be tolerated by a free secular people.
The religious test is coming. Are we ready?
Anybody who thinks this is an isolated incident is still kidding himself (or herself, or the sparkly gender-neutral/genderfluid self of the moment). The truth is, five years ago I still had Catholics telling me that gay "marriage" would never become the law of the land, and that there were more important issues to worry about.
It's likely true that Sen. Feinstein, at least, is more worried about Barrett's views on abortion than on gay "marriage". But it's the redefinition of marriage that has allowed the anti-Catholic (and anti-religious) biases that have been growing in our country in the last few decades to take off the polite mask of inclusion. Religious citizens can't be included if they are anti-LGBT bigots, right? Abortion gave the secularists no real grounds to silence their opponents, but the line we are hearing repeated endlessly these days (as mentioned in Rod Dreher's piece above) is that religious beliefs are no excuse for bigotry (and since any opposition to same-sex marriage can only be bigotry, then all believers who oppose SSM are bigots. Q.E.D.).
The next time anybody asks how someone else's same-sex marriage hurts Christians, you might answer that it's sort of harmful to be labeled a bigot and considered unfit for certain jobs, just because you don't think two men or two women are the same as a husband and wife. I doubt your interrogator will appreciate your point of view; in fact, I think the next party line will be that any harm Christianist bigots suffer for refusing to bow down before the idol of gay "marriage" and pour out libations (or bake cakes/arrange flowers/take pictures) is really their own fault, for holding such outlandish beliefs about the sanctity of marriage, the complementarity of men and women, and the need of children for a mother and a father in the first place.