Even people we perceive as saintly sin.I am talking about Christians who do not "sin", and live holy and blameless lives. Are you suggesting that Enoch in the Old Testament is not one of these?
Genesis 5:24, "And Enoch walked with God; and he was not, for God took him"
I have no doubt that there are MANY like Enoch, as I have personally met some, whom we could call SAINTS!
Only God knows the heart and that is where sin originates. There is no sinless perfection. Certainly there are Christians who strive daily to walk with God, but even those Christians are not perfect.