I do not support same sex marriages as I cannot see that same sex behaviors are Scriptural.
However I hope the church as a Body can become more informed on the underlying causes of this epidemic same sex attraction/behavior and marriages, and on a totally different note, gender alteration of various types. I believe if we understood the medical, embryological, environmental ramifications we would approach these matters with different attitudes, and some changes to our conclusions in some cases, not to sacrifice Scriptural morals, but how we handle these people.
Endocrine disruption and epigenetic chromosomal mutations are well established in medical literature, and many many cases of these alteration fall in those categories. They are birth defects caused by chemicals and other toxins or in some cases post birth injuries. Some of these toxins have been around since the Fall, such as heavy metals, poisonous plants, etc. But the upsurge of toxicity has skyrocketed in the past century or since the civil war and more particularly since the world wars.
I do not believe all cases of homosexual behavior is an environmental injury. Some heterosexual people simply choose to behave in an unscriptural manner, but many true cases of same sex attraction are injury. Unfortunately it may be that these dear people need to be celibate, and I say that with a lot of grief. Surely we can support them in their loneliness as a church family. Also when possible financially, we can begin to put teeth into our expressions of sympathy by rearranging our finances and choices to avoid these substances when we can, so they see we mean it. Its hard to counsel a SSA young person to be celibate for life with a plastic endocrine disrupting water bottle in our own hands. Sooner or later these kids are going to know what may have caused their situation.