We cannot name something as "sin". The word sin means "to miss the mark, to fall short", in our case it means falling short of God's standard.That's why Romans 3:23 says "for all have sinned and fall short of the Glory of God." We are sinners saved by Grace We will always be sinners but by the help of the Holy Spirit we strive to be more like Him who died for us. If you find a "Christian" who says they do not sin Gods word says they are self-deceived. As for "your own logic" that what gets us in trouble in the first place, Thinking we know more than "the Creator of everything". Just as a child rebels against their parents instruction so we do the same to our heavenly Father. The Good news is while we were sinners Christ Died for Us.