I don't know why people believe in religion (especially in today's world with the all information available few mouse clicks away) but I think it's their right to believe in whatever they want. For example I was raised in a family where my mother has been christian and my father has been atheist. Until I was 17 I believed in God and Jesus but after reading many books and documentaries I stopped believing. And it was on my own. Nobody forced me to believe or not to believe.

The most important thing is that whatever you believe in does not harm anyone. As long as you keep it for yourself and for your own spiritual good I don't see any problem. I know my mother finds strength in her belief so why would I try to convince her to stop believing.