That you don't like the comparison doesn't make it unfair. If the standard for allowing an institution is whether or not the Bible allows it, then you are going to have to consider everything the Bible allows.
It’s not that I think it’s an unfair comparison, it’s two different concepts...
One has hundreds of years of law going back to common English law and before and the other is a biblical text not updated in 2,000 years...nor should it...
Apples and oranges...