I attended a United Methodist Church for a year. One day the pastor and I were talking and he asked why I had ceased being a trinitarian. He listened patiently as I briefly recounted my story. When I was finished he told me, “You have a good biblical basis for being non-trinitarian but it all comes down to whether or not we believe the church got it right.”
He was speaking about the church decisions and decrees in the 4th and 5th centuries. I’ve since come across this same sentiment expressed by other trinitarians.
I asked the Methodist pastor what he thought about the Christians who lived before those decisions and decrees were made; non-trinitarian Christians. He replied, “God only knows. It’s best to leave such matters in God’s hands.” I thought that was a very good answer, but the pastor wasn’t finished. He added, “But we know things which they didn’t know.” I think that’s a good answer, too.
The Apostles taught that once born again you will receive Christ within, the spirit, that becomes our new nature. They then walked in that new life and with it produced the power of that spirit which is the power of God. Your church that you speak of killed the spirit and the Christ by making them something that is not even real. And that left the world walking in their old sinful nature without knowing the Scriptures or the power of God.