We are never asked in the Bible to be crucified for sin . True,It does exhort us, however, to take up the cross for denying self. The Lord Jesus instructs us many times, to deny ourselves and take up the cross and follow Him.
The explanation for this is that the Lord Jesus deals with our sins and with us very differently.
To wholly conquer sin the believer needs but a moment; to deny the self he needs an entire lifetime. Only on the cross did Jesus bear our sins; yet throughout His life the Lord denied Himself. The same must be true of us.
Liberation from sin is an accomplished fact; denial of self is to be a daily experience.
The purpose of God is never to reform the flesh but to destroy it.