You deeply misunderstand ‘fasting’ if you think it is in any way related to repentance.
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Indeed. I believe in fasting and I certainly believe in repentance. What I don’t believe in is penance. Men can’t atone for their sin themselves. Man’s best is still sinful (see Isaiah 64:6) so we would have to atone for our sinful penance. CHRIST bore the sins of His people on the cross. He paid the price! It is all about HIM!
“For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.”
— 2 Corinthians 5:21
“But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed.”
—Isaiah 53:5