Lack of belief in anything should be the default if one is rational in their approach to the world.  We are not entitled to "belief," but at best only to strong opinion.

I don't think (I have a strong opinion) that there is no God or gods.  This is based mainly on the weakness of the arguments presented for Him -- I have no need to assume the burden of providing evidence against.  Still, there is lots of evidence against -- from logical arguments to an objective look at the uncaring universe to the existence of suffering.  Theists have to rationalize out the kazoo to get around these problems with their view -- not a basis for sensible opinion forming.