It has surely to do with education. I am sure we get introduced to religion since childhood. Moreover, you learn about it from people you live with it or on daily basis. Maybe you are not ready. Philosophy, science and religion are the same. Their role is to teach people. They just show us what can be done in a society and what should not. I know that science and religion clashes often but it is because people were immature in the past. Philosophy, the mother of all sciences is closely linked to religion. The first universities were created by priests. I believe people are atheist because they lack knowledge or are just not ready to open their heart.