Why do you believe in god?

i have asked myself questions over and over again... i think religion seperates people... i think the bible is jus a manual to show u how to live and how to be towards ur fellow man... but i dont belive fully in christianity... i dont think one religion is better than another... but i believe there is a creator... but y think downwardly upon someone who has a belief different from urs... if u do, then ur no better than al queda or terrorists... we all hav our own minds and we choose what we want to believe... everyone isnt exposed to the same things as u... there is only one u... i've asked myself many questions, lookin up at the sky and where does it come from... Why does the earth jus sit in space and spin around the sun? and for what reason? u dont kno... i dont kno... it jus does... can u explain that... science will do its best, but even science is sometimes baffled... all i kno is one person knows everything...