Yes. Seriously. When you put your property up for sale you can’t discriminate against who purchases it. Period.
Get familiar with the law. Seriously.
You can by law specify the property's purpose or how it will be used in the future. If a buyer wants to burn it down or turn it into a hog farm the seller can reject that buyer. If The Church doesn't want to sell the property to those whose intent is to use and abuse the property through the practice of rectal sodomy within its walls, they can legally make that choice.
As noted above, for you to compare the cause of sexual perversion to the normal lives of normal black couples is beyond insulting to black people everywhere.