What strikes me about the article is the author's baseless assumption that marriage is specifically a religious institution, and definitely a Christian one. His assumption flies in the face of history and cross-cultural experiences.
People were getting married millennia before Christianity was ever thought of, and people still get married in societies where Christianity never existed.
Only Christian nationalism insists that Christians get to decide who can get married and who can't.
Look, a Christian can believe strongly that their faith dictates against them marrying a partner of the same sex. That's a personal decision everyone should have the right to make.
But Christians cross the line when they try to force their beliefs on others.
Besides being undemocratic, Christian nationalist or whatever, of course it's a lack of love. It isn't loving in any sense to force people to follow other people's religious beliefs.
That should go without saying. But you clearly needed to say it. Thank you.