Why people afraid to ask questions about their beliefs?

[Excited Penguin]

Hi guys,

Since i becommed atheist, i also began think more critically (more or less ).But why people don't ask questions about their beliefs (not only religious beliefs).I read in one philosophy book that questioning your beliefs is best way to see if they are worth believing in.So what do you guys think, why people don't question on what they hold so dearly, is because of fear, ignorance, or something else ?

Thanks for your answers

Did you happen to read Bertrand Russell by any chance? Just a shot in the dark on my part, really.