Sadly, in most cases, it is not that the church would owe taxes that would be the biggest issue - it is that too many of the congregation would stop giving tithes and offerings if they could not deduct them from THEIR taxes. Only a small percentage of regular church attenders even approach giving a tenth (tithe) of their income - that number would approach zero pretty quickly if the tax deduction would be taken away.
We have already seen the beginning of the separation of the wheat from the tares with the open apostasy of the Episcopal/Anglican churches, many of the Presbyterian, Lutheran, Methodist, UCC churches, etc... I think we will see that process accelerate with the coming persecution of any churches that hold fast to biblical principles. We will see which churches and which "Christians" are truly committed to Christ. If they will change their doctrine to keep their tax-exempt status, or to be more "culturally relevant", then they are not serving God - they are serving Mammon.
I agree with everything you said.
You hit the nail on the head-the wheat is being separated from the chaff. The sodomite agenda is one of the tools being used. God said that He can take that which was meant for evil, and use it for good, and this appears to be a perfect example. True Christians who try to exalt God above all, including family who are living in unrepentant sin, will be separated as wheat from the tares who would allow themselves to be blackmailed by the sodomites. AFAIK, and I have plenty of proof to think I’m right, none of my family is homosexual. (If they are, they’ve hid it well through decades of marriage, many children, homeschooling, witnessing for the Gospel, teaching their children to live Godly lives per the Bible, etc. But if the unthinkable happened, all of my family know the rest of us and where we stand-on the Bible-well enough to know that if they asked any of us to participate in a homosexual union ceremony, to not expect us. I don’t even think they’d be “offended”. The positions of my deceased parents, and that of my 9 siblings, has been clear over the decades. There’s not a chance that they don’t know. This would be one of the fruits of the harvest of trying to live by Bible precepts all these years-that our beliefs are not a secret, and anyone who issues us such an invitation, would only be doing so to test our conviction.