"But what if you're wrong?"
The best answer I have isn't mine ... it's Verna Dozier's and it comes from "The Dream of God:"
We want to be safe, to be sure we are doing the right thing. That to me is the voice of the Tempter.
Kingdom-of-God thinking calls us to risk. We always see through a glass darkly, and that is what faith is about. I will live by the best I can discern today. Tomorrow I may find out I was wrong. Since I do not live by being right, I am not destroyed by being wrong. The God revealed in Jesus whom I call the Christ is a God whose forgiveness goes ahead of me, and whose love sustains me and the whole created world. That God bursts all the definitions of our small minds, all the limitations of our timid efforts, all the boundaries of our institutions.
The urgent task for us is to reclaim our identity as the people of God and live into our high calling as the baptized community. We are a chosen people, chosen for God's high purposes, that the dream of God for a new creation may be realized. God has paid us the high compliment of calling us to be coworkers with our Creator, a compliment so awesome that we have fled from it and taken refuge in the church. God does not need such an institution.
The institution is replaceable. The living body of God's people is not.
"Behold, I make all things new" is the word of the Lord, but the institution damns newness as novelty or trend, and herds the sheep back to the security of the old fold. Jesus said, "You have heard it said of old, but behold, I say unto you ..." Yet the institution claims the Bible says only one thing, and only the church can interpret it.
Faith never says "This is how it was" but "This is how we saw it." Faith always includes the possibility it could at any given moment be wrong, and that is why it requires courage. Faith is taking the risk that what I understand today calls for commitment of heart and mind and soul, even though at all times I know that what I understand today may be revealed to be wanting tomorrow.
That's my answer.