Not to nitpick, but how is Judaism included as one of the three "great" monotheisms?

Presumably Christianity and Islam made the cut due to number of followers (combined they account, at least nominally)  for half of the population of earth. 

At around 20,000,000 followers only, Judaism is far behind and is not even the 3rd ranked monotheism. Sikhs outnumber Jews, and some sects of Hinduism are arguably monotheistic.  North Korea's "leader cult" numbers about the same number of followers of Judaism and by "strength of faith" probably beats all religions (North Koreans HAVE to believe in the leader...or else).