OK, just because a Baptist denomination (for example) may consider themselves the One True Arm of Jesus Christ doesn't mean it simultaneously thinks of the Presbyterians as a false arm. (Jesus' earthly body had more than one arm; so His spiritual body as represented in His Church can stand to have more than "one" true arm). Missionaries from multiple denominations often worship together...so these true feet of the body of Christ don't look @ each other & claim the other is a "false toe" of Christ.
Bottom line: Yes, every body has a contour where the body ends. But that doesn't mean that the claim to being authentic automatically equates to other similar claims being false. Body membership isn't exclusive to those who claim to be the true feet, toes or arms.
So how many of the ecumenical councils does the Baptists and Presbyterians accept? If they do accept any - do they accept all of the precepts or just some of them?
This is so we can identify each other and where we stand on the nature of the faith.