And you would be wrong.
You’re not hearing what I’m saying. The marriage union is not just a spiritual matter. It is the forming of the natural family, therefore it is the formation of the most basic unit of self-government. Which means that the broader government has an existential interest in the matter.
An incompetent person (insane) can not legally enter into a contract (or be held accountable for their actions)
Historically, being attracted to someone of the same sex was thought of as a mental illness. Basically, anyone attracted to a person of the same sex was thought to be insane and thus incompetent and unable to enter into ANY contract.
When the sodomites successfully infiltrated the American Psychological Association back in the 70’s and declared themselves sane, we lost the underpinning legal basis for denying sodomites the right to enter into a civil union or any other contract.