Religions and churches have every right to shoot themselves in the foot although I will admit that is one bizarre example of a foot fetish.
AbE: Since determining who or what makes someone a spouse is a secular contractual issue it really is irrelevant what any church or religion thinks on the matter.
Churches can only sanctify or bless marriages, they have no authority beyond what is delegated by the State to perform marriages and then only after the State has first sanctioned the marriage.
I have no idea what a gay union is. Is it like the IDP/HHW? Is there a membership charge.
The only revelation that I have is that all love starts and ends with Jesus Christ.
You can argue against this fact, but all that you have left is humanity--and you wont fully express your love for humanity without an insight deeper than mere biology.