"If marriage equality happens, i'm going to abolish marriage altogether"

I can't personally find any point in marriage nowadays except some legal details (in some countries) which shouldn't be there. I know I'm in the minority with my opinion, like in many other things.

The irony here is that abolishing the institution would lead to exactly what he's trying to prevent, equality and "ungodly relationships".

All countries, that I know of, have "legal details" associated with "marriage" or "union" (which may or may not be something clergy and/or lay clerks can register). Things like "next of kin", and rights and obligations relating to children and property, taxes, inheritance, etc.

Having a state "abolish" the institution of marriage would just make a lot more paperwork for everyone, as people write up individual contracts and other documents to establish the things you get automatically when you're "married". I don't see any state doing that.