Yup. Couldn't agree more.*
But look: if you insist that you are only going to unite against Satanic attack with people who share exactly the doctrine that your church believes in, you're going to be in a pretty small group. There are thousands of separate Protestant denominations, all teaching different doctrines. Their adherents all think their church has it right. Logically, then, anybody who disagrees with the teachings of their denomination has it wrong. But since the Protestant denominations do differ in beliefs and practices, they can't all be right.
So who gets to decide? Who is really the best interpreter of Scripture? Honestly, I don't think I am. I'm not smart enough to have it all figured out. It amazes me when I encounter Protestants, Catholics, Jehovah's Witnesses, Mormons, or whatever who say, "I know better than all the rest of you, I'm much better at interpreting the Word of the Lord than you are, and after my own study of the Word I decided on this church. The rest of y'all are going to hell. My church, which was started a hundred years ago" (or 20 years ago, in many cases) "has it right and you don't. So we want nothing to do with you and we're going to fight the atheist left on our own."
It is not for us to judge the relationship between another person and God. Leave that to Him, Who knows all. They're His Scriptures. Join with your brothers and sisters in Christ. People of other denominations, Protestant, Orthodox, and Catholic alike, all love and serve the Lord. Don't give Satan the satisfaction of separating us. Divided we fall.
*Psssst: the particular verse you quoted is one Catholics often use to maintain that it wasn't the best thing for Protestant churches to introduce new doctrines after 1500 years of Christian Catholic unity. Just FYI. :-)
Those that are saved are individuals not groups. We each have a personal intimate relationship with The Lord Jesus Christ. None of us has all the truth but we do have the Holy Spirit inside of us to bring us to truth if we do not resist it. Most of the protestant problems in unity are due to pride and common sense man mind interpretation. Fine examples of this is double predestination or those that believe in replacement theology.
That's so far off the mark as to be ludicrous.
There are not *thousands* of Protestant denominations to begin with. that has been debunked so many times that it's not funny, but I guess that never stopped anyone from buying the party line.
The other thing is, true believers in Christ do not identify with denominations because their identity is IN CHRIST, not in the church they attend on Sunday morning for worship, who whom they choose to affiliate with.
denominations don't save and if someone thinks they do, they're not saved because they're not trusting Christ.
I don't think the church I attend has it all right and everyone else is wrong and I doubt that there's a Protestant here that does. We left our Catholic upbringing behind us with the us vs them mentality.
And I don't think that every other denomination is wrong either. There are plenty of Protestant churches I could attend because I agree with their doctrinal positions on the critical areas, but instead of church hopping every Sunday, we picked one to attend, but that does not mean that by default, we think all the others are wrong.