CLAIM: Some interpreters argue that this passage supports the view that Christians can eventually become perfectly holy and lose their sin nature.
RESPONSE: Paul cannot be saying that we are without a sin nature anymore. In other passages, he describes that Christians war with their sin nature constantly (Gal. 5:17; Rom. 7:14-25). John writes, “If we say that we have not sinned, we make Him a liar and His word is not in us” (1 Jn. 1:10). Christian experience can easily attest to the presence of sin in the Christian life. The Greek word katargeo (pronounced cat-are-GAY-oh) for “done away with” could also be rendered “made powerless.” This word can be translated as “idle” (Mt. 20:3), “useless” (Jas. 2:20; 2 Pet. 1:8), “released” (Rom. 7:2), or “nullify” (Rom. 3:31). The NLT actually has the best translation on this word: “sin might lose its power in our lives.” Moo concurs that “rendered powerless” better suits this verb.
 Douglas Moo, Romans: The NIV Application Commentary (Grand Rapids, MI: Zondervan, 2000), 198.