Colossians 2:6-11 ASV and Colossians 2:13-23 ASV

Since the Word of God in its fullness is "Christ in you, the hope of glory", then the main task in the with-God life is to live life in Him and with Him and for Him, not to be distracted from Him by tradition or superstition that pervades minds and cultures so easily.
Continuing to live in him has several elements: 1) rooted: having only one source, being continually connected to Jesus by focus, by prayer, by thought, by interaction with the Scriptures that is a living connection of receiving, not just a depending on something you had already received; 2) built up: the analogy moves to something being built. Our lives are like that too, we are not finished products and so our living in him is letting Him form us into what He is meaning to build us into. 3) Strengthened in the faith: Is the faith the teaching or the living in terms of what cannot be seen? It seems we have used the word like it is a system of belief, while to them it would have been what it is like to follow Jesus and know He has a plan, even when we can't see it, and His way is good and best, even when things get harder because of it. Strengthened in the faith is making our trust muscles strong enough to stay on the journey with Jesus. And 4) We will only live our lives in Jesus when we remember the good and give thanks for it all the time, over and over, more and more, with great exuberance.
We need to know what keeps us in Christ, because there are things that would pull us away. We could be deceived either by tradition (we have life because we are doing religious things), or by superstition (we've got it right we are doing the right things or have somehow paid for things to go right.
Everything we need to know and experience and have in in Jesus: fullness of God in bodily form. When we really learn to live in him like vs 7 explained, we will have that fullness. What an incredible inheritance and gift of grace and life has been handed to us.
That means everything that isn't a part of this life, this fullness in Christ that is ours has to be left behind. We don't need anything making us think we really don't have this life, or getting in the way of our experiencing it or living like we haven't actually become the person Jesus has made us. But who we were was left behind, a kind of spiritual circumcision, cutting away our old tendencies and weaknesses and leaving them behind. A kind of death to what was like baptism. What we had done is gone and what we were is changed. So don't think your life has mostly to do with how well you keep the traditions. All the religious acts and memberships, all the attending and blending in aren't the real deal, the reality of what it was all supposed to be is just living in Christ - so do that and you are getting it right. Knowing Jesus is the goal, living with Him is the life. When we stay connected to the head, the supply, the source then we have life and we are connected to Him and each other in real & vital ways that produce spiritual strength and health and freedom.