Maybe it's because I'm not American but I don't understand what "the woo" is exactly here. The closest thing I can think of is the verb "to woo" which ... doesn't really make sense here. Could you possibly explain it?
It's a shorthand term for "hokey religions, mystical mumbo-jumbo, pseudoscience, quack medicine and magic". Not sure of the derivation - I'm guessing it's from "woo", the stereotypical ghost noise.
"Woo" is slang within the online skeptic community, popularized I believe at James Randi's forums. It's short for "woo woo", referring to the theremin-like sound heard in old B movies when "otherworldly phenomena" took place. It refers to beliefs and purported phenomena which are "out there" and lacking in rational, scientific basis.
