so what is the consensus on abortion, divorce, and same sex marriage?
That depends a lot on what group of people you are talking about. I anticipate that you are looking for agreement on these three issues throughout the world-wide Church, hence the need for one mortal person to be the authority.
The picture I've seen of the Church so far in my study leads me to believe that the Church was largely structured locally. The elders of a city governed the Church in that city, hence letters being written to "The Church in X City". The apostles who planted those churches did, obviously, exhort and teach them, but I don't see any evidence so far that they continued raising up new apostles for that inter-city function after Paul was called by Christ.
So that means, given the model I described earlier, it would be up to the elders of a given city to come together to decide the issues of abortion, divorce, and same sex marriage. Since that model is not being followed anywhere I know, there's no way for us to look and see what the consensus would be or whether consensus would be split.
I can look at the loose group of churches in my city that have fellowship together, and see a pretty clear consensus on all three issues, and no evidence that it is because any one person made a decree on any of those three issues. I'm aware that there are other churches who identify as Christian that would take very different views on them, but I have an inkling that all three issues would point to deeper doctrinal problems that would place some of those churches outside the body of Christ altogether.
You've given me a lot of questions, but I haven't seen you answer mine. Beyond the difficulty of not having someone to have the final word in disputes, do you see anything inaccurate in my description of how I see the governance of the church described in the Bible?
