>>668308
When I was less knowledgeable about Christ, I attended my cousin's gay wedding. I knew homosexuality was wrong, and he knew what I thought of homosexuality but I've never been the type to express my beliefs in anything but a courteous way and he knew that and, thus, invited me despite knowing I didn't approve because I would be polite and we enjoyed casual conversations with the other and were friends as children.
So I went. These days, I think Christians are called to come out and be separate from the heathen (as Paul reminds in 2 Corinthians 7:1) but I also remember that Jesus ate and drank with sinners and tax collectors.
The way I reconcile the two is that, anyone who is Christian, even though they be in sin, is worth having around if they desire change. Alternatively, if they've rejected Christ's message, then we shouldn't be seen hanging around them and acting as if we're okay with that sort of person.
My cousin was always quiet about his faith and now I think he's lost it. If I had it to do over again, I would've witnessed once, not gone, and cut him out of my life thereafter (I did witness and cut him out, just later).
If these are Christian but confused dykes, well, that's understandable. The world is crazy and people are vastly misinformed as to doctrine.
I would explain why God has moved me not to agree with or be present at the ceremony. If they're Christian, they'll be bummed but understand and will try to convince you on their view of scripture. In which case, politely disagree and say you offer your deepest apologies if you someday find you're in the wrong but that you think they are in error. If they get made about, then you know where they're at and you can end the relationship totally.