11 In him you were also circumcised with a circumcision not performed by human hands. Your whole self ruled by the flesh was put off when you were circumcised by Christ, 12 having been buried with him in baptism, in which you were also raised with him through your faith in the working of God, who raised him from the dead. 13 When you were dead in your sins and in the uncircumcision of your flesh, God made you alive with Christ. He forgave us all our sins, 14 having canceled the charge of our legal indebtedness, which stood against us and condemned us; he has taken it away, nailing it to the cross. — Col. 2:11-14 NIV
The life, death and resurrection of Jesus fulfilled the law given in the Old Testament. God is no longer concerned with whether or not, we are circumcised physically, His concern is with what is going on in our hearts. Our water baptism is an outward symbol of us going through the death and resurrection with Jesus, therefore our flesh is buried with Jesus and we are symbolically raised from the dead with Jesus. We are raised as new creations in Christ Jesus. All of our sin debt has been paid in full. There are no outstanding charges against us now. We need to hang onto that promise because satan is going to come around trying to convince us that we are not set free. Don’t listen to him, he is a murderer, a thief and a liar. If he can convince us that we are still guilty, he will destroy our testimony and make us useless in the kingdom here on earth. We must ask Jesus to be Lord over our lives and submit totally to His will. If we do this, when satan comes around. he will flee from us. So, when we have done everything God has asked us to do in a situation, then just stand firm and resist. How do we resist the devil? We do the same thing Jesus did, we use the Word to resist him. This mean we must spend time in the word learning what God says about our rights and our position in Him.
7 Submit yourselves, then, to God. Resist the devil, and he will flee from you. 8 Come near to God and he will come near to you. Wash your hands, you sinners, and purify your hearts, you double-minded. — James 4:7, 8
Once we have rebuked satan with the word, we just need to stand firm. God will do the rest, the power of His word will send satan scampering away. But we must stay on the alert, he will sneak back around and try the same and/or other tactics to try to weaken our resolve.