Defenders of tax exemptions and deductions argues that if we got rid of them charitable giving would drop. It surely would, although how much, we can’t say. But of course government revenue would go up, and that money could be used to, say, house the homeless and feed the hungry. We’d have fewer church soup kitchens — but countries that truly care about poverty don’t rely on churches to run soup kitchens.

Exemption advocates also point out that churches would be squeezed out of high-property-value areas. But if it’s important to the people of Fifth Avenue to have a synagogue like Emanu-El or an Episcopal church like St. Thomas in their midst, they should pay full freight for it. They can afford to, more than millions of poorer New Yorkers whose tax bills the synagogue and church exemptions are currently inflating.

So yes, the logic of gay-marriage rights could lead to a reexamination of conservative churches’ tax exemptions (although, as long as the IRS is afraid of challenging Scientology’s exemption, everyone else is probably safe). But when that day comes, it will be long overdue. I can see keeping some exemptions; hospitals, in particular, are an indispensable, and noncontroversial, public good. And localities could always carve out sensible property-tax exceptions for nonprofits their communities need. But it’s time for most nonprofits, like those of us who faithfully cut checks to them, to pay their fair share.