I left the UPC perplexed as to why things had transpired the way they did and sad that politics had hijacked (at the time) the organization. After I told my pastor how I felt about approach re: water baptism, he told me I was welcome to leave. I took him up on the offer. Mind you, I was his outreach director, taught his Search For Truth studies, taught his adult S.S. He chewed out my wife and me one morning after church saying he had talked to (my previous pastor) and wasn't about to have someone come to his church and split it! His neck veins were bulging, and I'm not exaggerating. It was a bad case of pastoral abuse. Then came the water baptism issue, etc, and I figured "enough is enough". I probably stayed too long. That home mission pastor's last words to me was, "It's mighty COLD out there, Brother .....". It was a lot colder in that church, believe me.
Over the years I've tried to fellowship UPC but with Very Limited exceptions have no response in kind.
Mirth, the best you can do is try to stay sweet, humble, and do what God is telling you to do.
Might does not make right and numbers don't mean they have a "corner" on the truth. In some areas they need to grow (as do we all in some areas). It may mean a long time of limited fellowship (esp if you live in an area where Oneness churches are dominated by UPC). Hold ON to God's unchanging hand and walk with Him. He hasn't left you and just because you left the UPC doesn't mean YOU left HIM! Stay in prayer. Walk WITH your spouse (and I'm only assuming you are walking together) and hold one another UP and encourage one another in the Lord.
I posted a thread asking what it would take for apostolic unity and was serious about the question.
"Who art thou that judgest another man's servant? to his own master he standeth or falleth. Yea, he shall be holden up: for God is able to make him stand" Romans 14:4 