Concerning the idea of fluid sexuality, I've not shared my thoughts on God, and where He fits in with this whole thing. That's because I hadn't wanted to. Because in my extremely narrowminded religious upbringing, there was no room for any other kind of sexuality except married, hetereo sexuality. I was told you could go buck wild after you got married (Christianity no longer advocated for just the missionary position anymore. Too many converted hippies became preachers to let that old trope fly). But still you couldn't dare to imagine that it was okay for men or women to lay with their own kind and get any kind of okay from God.
Of course, I'm in tune with the movement in religion towards supporting same sex unions. Some denominations are pro, and some are still way con. The words in the Bible continue to be reviewed, re-intrepeted, and reworked until someone somewhere hears what they want to hear.
Personally, I'm staying out of all that. I've spent years of my life on one side of that fence and it took a lot out of me. A LOT.
So now, I'm perfectly content to leave it up to God. Because as far as I'm concerned, I didn't make all this, He did. So it's not up to me to sort it all out, and frankly, who can use the headaches?
But I will say this, (as self-quoted from a comment I left at Old Lady's Place), However it is that God made us, He seemed to have included a door that can swing both ways if we so choose. But it also seems that we should be acting responsibly with the design, since I know of at least four committed relationships that were devastated by a switch in one of the partner's sexuality.
So yeah, I think that even though we can do with our willies and marys whatever we want to, we should act like responsible adults about it, seeing that we don't live in vacuums. There's no excuse for hurting the people you say you love. Reasons, but no excuses.