All Christians know from scripture that homosexuality is wrong. The bibles says so several times. And, abortion is pure baby killing. Taking an innocent life with a beating heart and killing it is morally wrong. Some churches have turned a blind eye on biblical teaching in those areas for whatever reasons.
Not to mention broadcasting it to the world. Seriously, I see people put things on Facebook for the world to see, when I considered some pictures of myself and my girlfriend, then fianceé, then wife, to special to publicly broadcast. Is something seriously wrong with this picture? Seriously, if you have some things to say about yourself, how public you make them says a WHOLE LOT about who you are. I personally don’t bother with plenty of photos about me making political statements. Unless the person knows me I could care less about them seeing some picture of me, and if they know me, well, the photo is irrelevant.
The recent huge demonstration in Paris against gay marriage had the right idea. It would be unpersuasive for them to appeal to the authority of the Bible, since huge numbers of French people don't take Scripture seriously (except for the Muslims). Instead they focused in on the fact that children flourish best in a family with their own married father and mother. In a "gay" family any children will be, by intent, by pla, --- by design --- bereft of one or the other. It's the deliberate creation of brokenness.