Despite its suffix, skepticism is not an "ism" in the sense of a belief or dogma.

"Despite its suffix, skepticism is not an "ism" in the sense of a belief
or dogma. It is simply an approach to the problem of telling what is
counterfeit and what is genuine. And a recognition of how costly it may
be to fail to do so. To be a skeptic is to cultivate "street smarts" in
the battle for control of one's own mind, one's own money, one'w own
allegiances. To be a skeptic, in short, is to refuse to be a victim.
-- Robert S. DeBear, "An Agenda for Reason, Realism, and Responsibility,"
-- New York Skeptic
-- (newsletter of the New York Area Skeptics, Inc.), Spring 1988