Sean Gallup/Getty ImagesFour adults and two young children believed to have been sucked into a bizarre online cult have gone completely off the grid since their disappearance last year, with Missouri police officers reportedly at a loss as to how to find them. Berkeley Police Maj. Steve Runge told NBC News on Wednesday that the missing people have “shut off their phones, shut off their social media, shut off everything.” Explaining that the police had “even” sent the group money on a cash app, o