Yes, it's indeed a lamentable pity that the sprawlingly vast majority of Christianity across 2000 years and five continents got it so completely wrong, and that one dogged group of old-school Presbyterians should nail it right on the head! Fie on the so-called children of the Reformation, who would subscribe to a doctrine so pernicious as that of free will! ;)
I would argue most did not get it wrong until within the last 500-600 years. Please remember the Jews did exactly the same thing in corrupting their religion; so are we any different? By the time Jeremiah came on the scene Judaism had evolved to a point where the Jews were setting up idols in the temple and worshiping other things all the while believing God was looking favorably on them.
People today no longer care about correct theology. They simply want to fashion God into however they perceive Him to be. The scriptures are very clear on the correct way of worshiping God. People simply choose to ignore it.