Because you don't seem to fully believe in the standards as they are taught in UPC, or in the salvation as taught by UPC, I believe you might be setting yourself and your daughters up for a life of ridicule and condemnation if you choose to attend a UPC church.
I would highly recommend not settling on UPC, but finding a church that believes what you believe! There are churches with more lively worship that are not UPC and not trinity. I think it would benefit you and your family to find one.
Might try this one:
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Hebrews 13:23 Know ye that our brother Timothy is set at liberty