Musket.
marriage is a word that Christians claim is purely religious
You just made that up Musket!
Anyway, it is older than any religion.

I agree about other ancient traditions needing to change, but why rush this one through without any of the usual democratic processes?
After millennia, a few more months hardly matter.

What other sexual orientations? Let's see, we have men wishing to marry women, men wishing to marry men, women wishing to marry women. I reckon I have run out of permutations there Akenaton. What other permutations are left with regard to marriage? I suppose you have polygamy, although not much call for it outside Utah USA

There is a sizeable minority in UK who would like to be allowed polygamy.
Also child brides.
Incestuous marriage is already allowed for first cousins and could be extended to other close relatives.
All could be justified by equality.

Equality isn't a Labour whim. It isn't a Conservative whim either. It started in modern history with votes for women, got a kick start with the post war government and Human Rights, continued with European values and now, the final frontier, removing the stigma of choice of those you wish to marry and intend to share your life with.
Same sex marriage is a whim.
It was never mentioned when Labour was forming its equality legislation, or when Civil Partnership legislation was going through.
It has just been conjured up out of nowhere.