This is why you have a good argument. When we give into sin we become a slave to sin.
Here is a better way to see it.
In the "time of the Gentiles" there are 2 dominions : as stated by Paul.
1. Dominion of the Law
2. Dominion of Grace
In the life of a person, these exist like this. "under, the".
See that?
So, in both cases, you can be under the dominion. of one of those..
Now notice this carefully...= "the power of sin, is THE Law".""""
See that?
Now notice this. "Christ has redeemed us from the CURSE of the LAW.
And what is the curse?
Its the laws power to empower you to want to sin.
The means that the Law's dominion empowers you to sin. It causes it. It energizes your flesh to overpower your will to resist if you are born again, and if you are not ,then you just sin and enjoy it.
Christ has redeemed you from this curse, if you are born again,
BUT= you have to walk in that, in your mind of faith, by Right Believing.
How to do that, if you are born again?
You exist not under the law., is how., as if you exit there, you are "fallen from Grace".
Whats all that mean?
It means that to stop sinning, you stop believing that you can resist sin and win........and, it means that you stop believing that you can lose your salvation.
So, what happens when you get into that MIND of Right Believing?
A.) you stop being under the law, and the CURSE is broken and ended, and you thereby start to exist in the correct mind of Faith, that is Right Believing.
And in that right mind, that is now renewed, you are walking in the Spirit.
Walking in the Spirit, is to exist in the Grace of God, as the renewed mind which is the "mind of Christ".
This is how you walk IN The Light., and when you are there, you are not going to sin, as you are delivered from the curse of the Law that was empowering you to sin and sin and confess and sin again.
You end up here....>"Christ always gives me the VICTORY" as Paul teaches you.