In Christ; we are more than conquerors; we are children of the King for eternity; we are free and stand in Grace; Satan has been defeated (Col 2:15). However; we can 'fall from Grace (Gal 5:4)' through religiosity. Modern church has lost its connection to The Head; Christ (Col 2:19).'Religious reversionism' starts with criticism; judging (Col 2:16) and peer pressure (Col 2:18). Paul preached against it in Gal 2:1-5 (Rom 14:5) emphasizing freedom (Gal 5:1-5) but fell prey to it in Act 15:1-2; and Act 21:15-26.
Paul never met the Colossians but wrote to them from a Roman prison around 62 AD to counter misconceptions of his day. It magnifies the character of Jesus Christ more than any other book in the New Testament, and counters misconceptions of our day as well. The key verse may well be Col 1:18 "...that in all things, He might have preeminence."