Frankly, I wish I could come to some other understanding of the relevant scriptures than homosexuality being a sin. I have read some other views on how those scriptures should be understood and it seems to me to be a pretty big stretch. TBH, I tend to like gay people a lot more than most of my fellow Christians (irl anyway) and personally, I don't see what the big deal is. I have a lot of cognitive dissonance about the whole thing.
As it is, I am well aware of the many other (and more harmful, IMO) sins committed by Christians -- have been on the receiving end as well as the committing end countless times.
Politically, though, I am very clear about how I feel and what I think. The government has no business enforcing my religious beliefs onto my fellow citizens, gay or straight. I believe we should have civil unions for tax, insurance, etc purposes and marriage should be the domain of the church and it's equivalents. I don't even see a reason to make the unions two person only things.