The problems we mostly encounter arise from the presuppositional level, so the need is to start our discussions and address faulty presuppositions first. The Holy Scriptures are the breathed out Word of God, having all authority. Perhaps this is why God has commanded that we preach the gospel, make disciples, and teach them(?) The foundation is then laid in the Truth and we build upon that foundation. If there is no Rock sold foundation the structure crumbles in the storm of life.Not anything in particular.
I’m just thinking that plenty of folks read the same scriptures that we do, but don’t see them in any way permitting plural marriages. I believe their sincere conviction that they believe it would violate scripture. I honor their belief that it is Spirit led. For us to say that they are wrong in their interpretation is in their eyes a violation of scripture AND Spirit. What is the path to reconcile that?
There are many people who have taken His name in vain. They are the tares, the "Lord, Lord" sayers. Get the foundation down, or check what foundation there is before trying to build. If we are not grounded in the same Book, trying to understand His Word with the same, or very similar presuppositions, we're probably not going to make much progress.
Just my £ 0.02.