There is a reason wikipedia is considered a suspect source in scholarly circles.
The definition it gives of “Progressivism” is the one self-proclaimed “Progressives” (later “liberals”, now “Progressives” again) used to sell their ideas, rather than a dispassionate description of the movement’s views. (Hardly surprising considering the dominant political views of wikipedians.)
If, however, you look at the program of the American left from the time it called itself “Progressive” near the turn of the twentieth century to the present when it is starting to use the name again, having exhausted the benefit they got from stealing the name “liberal”, one of its fundamental premises is the denial of the Fall. Man is either fundamentally good or a tabula rasa. The moral-relativist strain of progressivism favors the former, the more totalitarian sort, the latter.