Why is it that we have SCIENTISTS and OTHER INTELLIGENT??? people that believe and follow a religion?

stop questioning and think, maybe they had a reason to believe, i hope my b eliefs don't interfere on how you may rate me but seriously, my grandfather was on the scientific council of the world and still he went to church, and has always believed in god, he still odes as a old man. the problem with atheist is not what tthey believe but how they view others on their religion.