Dreamguy, you ask a good question, here is a solid biblical based article that addresses your question.
Here is an excerpt (the link follows)
"1 John 3:10 John sums up his thoughts: "In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother." I don't care what anyone claims--if they are not righteous, they are not Christians. A Christian habitually practices righteousness, but occasionally sins; he doesn't habitually sin, but occasionally does something right. Sin is incompatible with the law of God, the work of Christ, and the ministry of the Holy Spirit." - John MacArthur
Why Christians and Sin are Incompatible (2111) (1 John 3:4-10) - Grace to You
I hope it helps, God bless,
Kevin