Not surprising, given my experience. Most religion majors I've met were relatively smart and often made fun of the more fundamentalist/evangelical types who typically were turned off by their religion classes. Religion majors seemed like philosophy-lite majors (which is consistent with the rankings).

Edit: Also, relative to Religion, econ has a bunch of poor english speakers that pull the other two categories down. (Note: the "analytical" section is/was actually a couple of very short essays)