Speaking as someone who's genuinely considered Christianity in the past (hey - don't laugh. It's true
), when I see a Christian church or denomination that preaches rules for sexuality at the expense of preaching charity and forgiveness, I take this as a big red flag warning me to stay away.
I think this is one of those issues where while you can cherry pick verses to support any particular view, it's just not compatible with the message of the Gospels, approached honestly. IIRC, Jesus called those who were more worried about others' "purity" than the contents of their own hearts and the well-being of those around them "whitewashed tombs" and "broods of vipers".
It sometimes boggles my mind how so many Christian groups could have, IMO, lost their way so badly from the straightforward message of the Gospels. Not all, of course - I have a number of Christian friends who take it very seriously indeed, including people here on RF, but there's just some stuff that comes out of mainstream Christianity where I want to pull the person preaching it aside and ask, "dude - have you even *read* the Bible for yourself?"