Michael, I could have asked you if you believe that God requires an impossibility from you, and if not what command is it that you do not believe you can follow and why? What is entire sanctification about other than simply obedience to the known will of God in a consistent manner?
"Without me ye can DO NOTHING" - Jn. 15:3
He is not talking to unbelievers but to his trusted apostles. He is talking to those unto whom he confessed that they should rejoice because their names were already written in heaven.
Lu 10:20 Notwithstanding in this rejoice not, that the spirits are subject unto you; but rather rejoice, because your names are written in heaven.
The Lord has not chosen to give any of his unglorified servants FULL measure of the Holy Spirit or the FULL measure of faith or the FULL measure of grace here and now and that is exactly what it requires to live sinless like Christ who had the FULLNESS of the Spirit and FULL of grace and FULL of faith.
Sin in the life of the believer is determinately used by God to grow that person in grace and is nessary in the leraning and growing process of the Christian life. That does not mean that God approves of sin but he overules and uses it for our "good" as he does "all things" that are not consistent with His REVEALED will but nevertheless are permitted and used by Him ultimately for our good and His glory. It does mean that He purposely does not give us FULLNESS of His Spirit and FULLNESS of faith and FULLNESS of grace to consistently live a sinless life.