” Protestants are not going to unite with those they believe are theologically in error. “
Since every one of them claims the right to decide what Scripture means and what God wants, you get YOPIOS and a thousand schismatic splinter pseudo-Churches. Nice.
Opposing that is the 2,000+ year old Church Christ founded.
And where is it written in Scripture that only a select few are capable of interpreting Scripture? If the truth be known, there is a tremendous amount of agreement on the "essentials" of the faith...most of the disagreement is found in the styles of worship, and the organization of the church. And those are not necessary for entrance into the Kingdom of God. There is broad agreement with the words of Jesus when He tells Nicodemus "You must be born again", and the words of Paul when he says that we are "saved by grace...not works."