I mean we have academia, which is essentially secular study. Moreover Atheist don't need to go to church together to indoctrinate their beliefs, that happens every day when no miracles happen and the world continues to be kill or be killed anywhere animal intelligence has not overcome that reality in some small pocket. Atheist also tend to understand that their is no forgiveness and they have to sit with their actions for the rest of their limited days, so it's not a great idea to go out and do terrible things for treasure.