Mine included.

No, it doesn't change what a Christian is, but it does go against certain interpretations of the Bible. Following that Bible is fairly fundamental to the Christian religion. (I'm not going to get into which is and isn't the "correct" interpretation of God's Word...)

I think the State should ensure that there is marriage for homosexuals - or, at the very least, an option for people of all orientations that is equal in Law. The State should ensure that there is full freedom for all, so long as that freedom does not harm another person or their property.

But the State should NOT impose its opinion on private institutions. People can vote with their feet should they disagree with institutions' rules. Or earnestly talk with them to do what they can to change those rules. But enforce laws where harm does not come into it? No.

I do not think that my church should perform those marriages (either by the decision of Synod or through State dictate) because it's my personal opinion, based on my understanding of the Bible, that homosexuality is wrong. MY opinion, one I do not, and never will, force on other people.