We all sin-Christians included. It's just that God the Father uses us in spite of our nature. And He can look on us because of the precious work of Christ.
Peter warned Christians not to be considered a "a murderer or a thief or an evildoer or as a meddler" (I Pet 4:15). And Paul tells us not to think more highly of ourselves as we should.
I see that YOU really need to be careful...
Rom 6:9 For we know that since Christ was raised from the dead, he cannot die again; death no longer has mastery over him.
Rom 6:10 The death he died, he died to sin once for all; but the life he lives, he lives to God.
Rom 6:11 In the same way, count yourselves dead to sin but alive to God in Christ Jesus.
Rom 6:12 Therefore do not let sin reign in your mortal body so that you obey its evil desires.
Rom 6:13 Do not offer the parts of your body to sin, as instruments of wickedness, but rather offer yourselves to God, as those who have been brought from death to life; and offer the parts of your body to him as instruments of righteousness.
Rom 6:14 For sin shall not be your master, because you are not under law, but under grace.
Rom 6:15 What then? Shall we sin because we are not under law but under grace? By no means!
Rom 6:16 Don’t you know that when you offer yourselves to someone to obey him as slaves, you are slaves to the one whom you obey—whether you are slaves to sin, which leads to death, or to obedience, which leads to righteousness?
Rom 6:17 But thanks be to God that, though you used to be slaves to sin, you wholeheartedly obeyed the form of teaching to which you were entrusted.
Rom 6:18 You have been set free from sin and have become slaves to righteousness.