Atheists: If God doesn't exist, then why do the world leaders/elitists gather in Sonoma County, California...?

... (Bohemian Grove) each year and act out mock human sacrifices, and other Satanic rituals? We're talking about world leaders here. If religion is used to subjugate us by those in authority, and is completely made up, then why do they worship Satan? Isn't he supposed to be a made up character? There is plenty of footage from the late '70s, early '80s (this was when Alex Jones was still a baby, so don't play the tin foil card).