Repentance is not understood in Christianity. Repentance or Teshuvah in Hebrew, means to return to G-d and return to keeping His Torah. It does not mean to feel sorry for your sins and tell G-d you’ll try to do better. Real repentance has always meant returning to Torah. Rome abandoned the Torah and sought to pick her way through the commandments like they were a Brunch Buffet, choosing the statutes that she could credibly blend with the Greco-Roman Paganism of the Empires’ masses. The result was a Jekyll and Hyde Institution that could produce great culture as well as great evil. What a mess! Now the whole structure is failing under the stress of Post Modern assaults and it does not have the ability to project power in a decisive way. Isam does not have this problem. The Answer is for Christians to return to their identity as grafted in branches of greater Israel. That would mean that they would say, “We were wrong! Help us to come home!”
Come home to whom? Those who have rejected their Savior to this day?
Repentance is a change of heart from our damned destitute ways to God’s narrow path.
And only God can lead us there by putting His Spirit in us to walk in His statutes:
Ezekiel 36
23 I will set apart my great name to be regarded as holy, since it has been profaned in the nations you profaned it among them. The nations will know that I am Adonai, says Adonai Elohim, when, before their eyes, I am set apart through you to be regarded as holy.
24 For I will take you from among the nations,
gather you from all the countries,
and return you to your own soil.
25 Then I will sprinkle clean water on you,
and you will be clean;
I will cleanse you from all your uncleanness
and from all your idols.
26 I will give you a new heart
and put a new spirit inside you;
I will take the stony heart out of your flesh
and give you a heart of flesh.
27 I will put my Spirit inside you
and cause you to live by my laws,
respect my rulings and obey them.
https://www.biblegateway.com/passage/?version=CJB&search=Ezekiel%2036
Exactly right. Torah allows one to discern the oommon from the set-apart. How can one 'sin no more' if one does not understand what sin is?