“As you therefore have received Christ Jesus the Lord, so walk in Him, rooted and built up in Him and established in the faith, as you have been taught, abounding in it with thanksgiving.” Colossians 2:6-7
There is a big difference in making a decision for Christ and walking in Him. The plan of salvation is to transform you into a new creature in Christ Jesus. You die to self and live for God. Everything in your life changes as you come to know the Living Christ.

The admonition is to be grounded in Christ and to build your life on Him. You become grounded in God by abandoning your life to Him. Christ becomes your sole reason for life and the priority in all your thoughts and actions.
It is the action of abandonment and yielding to the Spirit living within you that pleases Christ. It is a living discipline of prayer, meditating on the Word, and listening to the voice of God. You literally walk with Christ through the Holy Spirit.
It is impossible to be grounded through an intellectual approach or doing works for God. You have to come to know the reality of the Living Christ. This happens as you become baptized into the death and ressurected life of Christ.
Christ is about devotion and loyalty not works. Knowing Christ and coming under His authority is the priority of a believer.
The essence of Christ is living with Him by faith. Your life with Christ will begin with faith and will be sustained by your faith in His promises. Faith is unyielding devotion to God regardless of your circumstances. Abraham believed God and His life was uprooted.
Faith is living in obedience to the voice of God without any evidence or proof. You believe God calls things that don’t exist as if they did.
Faith is expressed in thanksgiving to God for who He is and not for what He does in your life!