Nonsense.
The self sacrifice of the Christ is completely sufficient as payment for sin, even continued sin to some extent. But to say that atonement is of no effect, or that it isn't sufficient to wholly change you (you being the believer) not only in words or outward character, but fully and wholly and actively turn you from your own wants and addictions, then you are denying the work of GOD. This really is very close to denying the Holy Spirit, but as someone alluded to; it very well may not be that you deny it, but that it is shut off from your processes totally; as a door that is locked from the other side, or an eye that has been seared with a hot iron. Indeed; if you really honestly think that the work and self-sacrifice of Jesus the Christ of GOD isn't sufficient to turn you from continued knowing sin, or that, contrary to scripture; you believe that one isn't to persevere until the end and strive for what is good, being faithful to the Word of GOD, then the good news is seemingly lost to you.
Thanks be to the Christ for His mercy, by the Will and Spirit of GOD; all any need do is repent from what they know is wrong. Thankfully for you, and me alike; if in honesty we do not know a thing; then it isn't counted, or weighed against us. May the mercy and long-suffering of GOD suffice us to repent and follow the Way along the narrow path home.
Peace, sincerely
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