I can get those people who are religious in the 50's and 60's, they didn't have access to communication or information like we do. Most peoples world's revolved around what their parents told them and what their schools told them.
You kind of stick with it when you get older. But today, there are far less people like this because we have access to the world not just a bunch of retarded adults point of view. But still there's a handful that you just want to murder.
Offing all stupid people would basically also kill off all the religious people to.