Those people just don't want the hard cold truth and they delude themselves that they have some purpose and they have to do magic rituals to please their sky men. They've done this for probably decades, if they haven't changed their mind by now, they never will.
I don't know how people don't know how to be good without the fear of hell and holy rules, or why they can't appreciate nature as it is. I don't know what to tell you OP, I honestly don't know how it's possible in 2015 with all the information available to us to believe in stuff like that, but sadly here we are.
My only explanation is group mentality and fear of death probably.