Organised religion is fixated with breeding. It owned the concept of marriage for a very long time. It forbade sex outside of it, and then dictated who could marry who.

It's all about exploiting the human sexual urge in order to put future generations of bums on pews. This is why it hates masturbation, homosexuality, contraception, transgender surgeries that result in sterilisation, or sex outside of marriage that might not brainwash the ensuing offspring to repeat the entire process when they're old enough. Basically anything that interferes with the process of a good [insert religion here] wife letting her [insert religion here] husband bang her whenever he wants to, and churning out more [insert religion here] followers along the way, is a bad thing.

It seems that couples that choose not to reproduce don't fit in with the business model either, even if they do tick all of the other boxes.

I wasn't surprised that a Christian drew that conclusion. I haven't read the article but my understanding of scripture could easily lead to a conclusion like that. Scripture demands that marriage has a person who is the head (a male) and a person in subjection to the head (a female). Gay marriage for men would give equal status to the partners.

But I want you to understand that the head of every man is Christ, the head of a wife is her husband, and the head of Christ is God. - 1 Corinthians 11:3 ESV