Why limit the response to Romans 6:1-14? Isn't the answer to the question about Romans six found in chapter 7?
Okay, this paragraph I'll play by the rules. If sin had absolutely no power over us, chapter six is a waste of ink. It is possible to present the members of our bodies to sin as instruments of unrighteousness. (6:12-13) Why say "don't do something" if there is no pressure to do so in the first place? Isn't that like telling a fish not to fly to the moon? As believers, it is possible to let sin reign. Must it? No, we are freed from sin. Should it? NO! Absolutely not! (Or as one translator puts it, "What a ghastly thought!")
Reading ahead...As believers, the good that we want to do we don't do. Instead we do the very thing that we hate. Yes, the ultimate penalty or wage of sin (second death) is dealt with, but we are not immune to it's siren's call. As believers, can we "not sin"? Yes, both the present chapter, Romans 6, and 1 Corinthians 10:13 seem to indicate that we can "not sin" (BTW, that would probably be the verse that Captain Scott was referring to.)
Another passage to consider would be 1 John 1:5-2:2. If we say that we have no sin, we are deceiving ourselves. If we confess our sins, He is faithful and righteous to forgive them.