Calling themselves married doesn’t make them actually married. Can a woman call herself a man, and be factual? The privilege to hold a piece of paper saying they are married is not the same as consenting adults of opposite gender who are both single and not blood relatives having the right to marry. That right comes from God. The privilege of the paper is a government given thing and subject to the whims of whatever governing body is in power. Also they aren’t binding on God, and in the US at least, not binding on those who object religiously under the first amendment, though that is under attack. Calling a spade a heart doesn’t make it so.