I see I was afraid this was what this was about. i was hoping your question was meant to be a provocative question to make us ponder more on what it means to be a Christian however sadly it seems this is about not sinning and ties in with those who admit they sin not being saved. As I am sure you expected yes I do sin I fail I slip up i am imperfect and am not sinless however if one is to judge another's salvation according to performance then they need to first search their own heart
(1 John 3:5-6) “Now you know that he appeared in order to abolish sin, and that in him there is no sin; anyone who lives in God does not sin, and anyone who sins has never seen him or known him.”
(1 Corinthians 3:1-3) “Brothers, I myself was unable to speak to you as people of the Spirit; I treated you as sensual men, still infants in Christ. What I fed you with was milk, not solid food, for you were not ready for it; and indeed, you are still not ready for it since you are still unspiritual. Isn’t that obvious from all the jealousy and wrangling that there is among you, from the way that you go on behaving like ordinary people?”