When gods, satans, saints and devils party together

Is this scenario possible in a world where religious purity and pedigree are reaching a stage of mutual exclusivity? Many religions still preach that theirs is the only true religion and the rest are worshipping devils or satans. Would such believers, so faithful in their beliefs, unyielding and incorrigible to the heel, go partying with those whom they believe are devils or devil worshippers?