Here's something I posted at Facebook in response to a query about my being a Christian and opposing Prop 8:
Precisely as an avid follower of Christ - he made it clear that marriage and family, though important, were not the last word in God's scheme ... family could be the source of one's greatest opposition - Jesus reminds his followers to be prepared to "hate" the family, that is, "reject if necessary" ... and when asked about who would be married to whom by the Sadducees, he says there will be no marriage in heaven.
As a Christian, I have looked long and hard at the relevant Scripture, including the Leviticus material which you well know also condemns a farmer who sows two kinds of seed in the same field and anyone who wears two-fabric clothing. The Bible says everything, so, in effect, it says nothing, until we put our hand to it.
If there is a final law, our Lord said it: Love ... love trumps all other laws!
I stand with Paul when he wrote his letter to the Romans - they accused Paul of being a libertine - what with his grace, they suggested that he was allowing anything to have a go. Paul rightly protests, but Paul is clear: if an error of judgment is going to be made, he makes it on the side of grace, not of law.
He'd been there, done that ... and after being "enlightened" on the Damascus Road, he opts for grace first.
I'm not sure any of this addresses your questions, and I have long since ceased trying to dissuade or persuade anyone ... but I try to bear witness to the Lord I love.