Basically, if the guru is just some slightly weird guy that has some good sense about something, someone who can give good tips on living or is just good at fixing things, then he is fine. If he is telling you to drink Kool-Aid mixed with bleach so that you can rise as a warrior angel for the war with the Flying Spaghetti Monster against Slenderman and his army of demonic Bronies... Either you run or you're on some kind of hallucinogen.
From their page on Stigmata, describing a painting of Saint Francis being granted the marks:
Their page on the Ku Klux Klan is a hilarious lampshade hanging on the fact that the Klan today is little more than a bunch of pathetic idiots with egos that need to get a life. And the whole time they keep making deliberately bad jokes by replacing usage of the letter "c" with "k".
"They should get a KLUE and KLOSE their doors for good."
Their article for Todd Akin (aka. the "Legitimate Rape" guy), presents the theory that Akin is secretly a chicken in disguise.