Almost ready to get off the fence

I've been following the whole equal marriage debate lately because, well, because it matters to me, but I'm still unsure where, as a Christian, I should fall on the matter. But I think I'm coming to a conclusion, having wavered for a long time.

I still have a couple of questions; I'm not entirely clear, despite the best efforts of others to put me straight (no pun intended), why civil partnerships are not good enough.

I do have reservations about the redefining of marriage; is this the first step towards legalising polygamy? Or, if Lord Tebbit is to be believed, incest? It's a valid concern, I think, although in honesty Tebbit all but persuaded me to vote in favour of equal marriage just because he was so fricking ham-fisted in his arguments. Moreover, how 'equal' is equal marriage if you still have to preface it with 'gay' or 'lesbian'? (And why do some people still refer to 'my lesbian partner'? I can see you're both girls, just call her your girlfriend, or partner, or whatever. And yes, I see that is an argument for being able to use the word 'wife', just don't call her your 'lesbian wife'.)

Anyway, Tebbit-factor aside, here is my latest reasoning:

I am pro-marriage and not anti-gay; that should make the call obvious.
I do believe that homosexual activity is against God's wishes; for that reason my issue has always been with the idea of churches being made to offer marriage to all orientations. This appears to have been addressed, so my main argument against it no longer stands.
My religious views, for want of a better expression, still stand, but if people want to get married other than in a church, my religious views don't really matter. I never intentionally hold non-believers to Biblical standards, and on sooooo many levels it's not my place to judge anyone!

I'm pro-marriage, and I have gay (non-Christian) friends - why would I want to deny them marriage (if that's what they want - my friends would have been quite happy with a civil partnership, hence my confusion).

So, yes, Ithink I've come round to a position of gay marriage outside the church is ok.
Inside the church is a different matter, of course; but again, we are all different, all called differently by God and all relate to him differently. That is a different argument, which I don't need to get involved in at the moment (thankfully!)