Seems to me that before Christ came, man had shown himself to be incapable of self-managing his sin, and God had to do something extreme to get people to pay attention, be it Adam & Eve, Noah, Sodom.    Then, he came up with a good plan: codify the law through Moses as sin-management.  And that worked pretty well, but all was still not right, so he sent his Son through which the Church was formed as, yes, sin-management 2.0.   And we managed to get almost 2000 years through that before the Devil found a way to destroy the Church from within and without by those who embrace their sin.