John UK wrote: The elect church at Colosse was neither Protestant, Presbyterian-denominated, nor had they even heard of Mr Calvin.
Truth does not change. Biblical truth - Reformation truth and truth today remain the same.
a) God ordained the Reformation. Those to whom God gave the grace to recognise the heresy of Rome and the grace to leave Rome and protest against its unbiblical works were/are the Protestants.
b) Presbyterian simply applies to the Biblical form of church government. Namely Jesus is the Head - and all are beneath Him. There is no hierarchy on earth in the true church.
c) Calvin and 5th century Augustine are two of God's servants whom God has used to teach the true Biblical doctrines of Christ. When one perceives the Biblical doctrine in truth, then one simply agrees with Calvin. Those who do not perceive the Calvinist teachings of doctrine are invariably works based salvationists and free willers who cannot comprehend sin.
John 3:21 But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God.