I was recently asked about Christians who sin....
1 Thessalonians 5:6-24
Notice a theme in that group... look at verse 15:
"15 See that none gives evil for evil to anyone, but always pursue the good, both towards one another and towards all."
Eventhough the wording is slightly cryptic, it is easily seen that the sin nature that we are all born with still wars with our new creature even after being saved.
This walk is a journey... keep your eyes on Him; when you sin... repent, when sin is near you... pray, when you feel the need to sin... cry out to Him to show you the path and give you the courage to follow it. He will guide you and keep you... as long as you keep Him.