I am a total disbeliever.
I do find it odd that almost every (or even possibly every) human society does have some form of belief system, involving either super-natural beings or natural forces as some form of being. Perhaps it is a fundamental need for many?
I have always thought (quite possibly wrongly, I have never researched it) that organised region, with priests, mullahs, etc could only develop once a society had advanced to the point of producing surpluses (of food at least), at which point it is possible to have "non-productive" members of society (ie the priests etc) being maintained by the masses.
I don't have a problem with those who do believe (no matter what their choice of belief), provided they keep their beliefs "on their side of the fence", and, I will similarly keep my lack of belief "on my side of the fence".
Unfortunately the latter point appears to be very difficult for most folk.