A flaw which began with those who founded our country. Jefferson, John and John Quncy Adams, among others were Unitarians. They saw reason and works as the road to salvation. And, with the best of intentions, they did do good works. But gradually the church, which was very powerful at the time, shifted the emphasis from the works of the individual to the works of the state. Harvard led this charge into statism and tryanny.
What was a Christian church at the time of Jefferson and Channing now makes no pretense that it is not.
But the notion of people doing good works is anti-Eden, if such works are believed to matter (and if they don't matter, why are they described as "good" works?).