Hi,
I never bring up any controversial subject in a group setting unless it has gotten to the point where truth must be defended. That goes for any subject. Not that it helps, but I try to do it from the "You might want to consider" concept while reminding the group that God's word is most important. Opinions are just that. Church doctrine comes about as man's idea of what scripture taught, but is sometimes modified over the generations. Some doctrines are based on a bad translation.
There was a while when I wondered if "Ask Me About Polygyny" was written on my forehead. Of several instances the one that stands out the most was in the hospital in Nashville. I am standing at the foot of my Dad's hospital bed. Mom was there as well as three nurses and my wife. Dad couldn't talk and Mom was in the beginnings of Alzheimer's. The conversation had been about Dad's progress. One of the nurses looked at me and asked, "What do you think about polygamy?". I quickly told her it was scriptural and fine. She was satisfied and left the room. Never saw her there again.
The worst I have ever seen was a little church in North Carolina where I suggested that Gomer didn't run away. Scripture says nothing about that. My wife and I had studied it out that week. We really hadn't noticed it before. So we suggested that God directed Hosea to take as wife a friend of Gomer's. It all works when you consider the two houses of Israel. An older gentleman across the room got so mad he started spitting trying to talk. He literally couldn't form words after that. That was a learning experience to me that any one could get that upset over an idea. Of course no one could prove that Gomer ran away, but they preferred the lie to what scripture said there. Who knows maybe years later someone who had been there was helped by that?
Personally I don't usually tell the preacher anything. There is no scriptural precedent that the preacher is some sort of go between between man and Christ or man and the church. The position of Elders come closer to that, but usually they don't know any more than anyone else. There are always exceptions of course. Eventually after enough helpful comments in Bible class one of them might approach you. I answer anything they ask, but I still have yet to meet any who were interested in what the scripture said. Their main goal was to protect the status quo and church doctrine. Breaking the status quo can upset grandma, split the church and ruin a nice paying job for the preacher.
Sure wish I had known about the Greek behind 1 Corinthians 7:2 more than a couple years ago.
Tim