So if a Cult pejoratively refers to a group whose beliefs or practices could be considered strange or sinister then I'd just have to prove that atheists are atheists are a group (given) with common beliefs (given) and are considered strange (there are some wierdos here) or have sinister motives (I'm sure there's at least one troll on here somewhere with an atheist tag, quick fr0d0 change your tag) 
