How is it that rejecting the idea of a higher power, greater than humans, is a prerequisite for scientific exploration or an open mind? Religion aside. If believe that I am in a position to claim for certain that there a higher power, greater than humans, can not possibly exist, simply because I can't sense it with any of my five humanly senses, then I am just as narrow-minded as any christian, muslim, hindu, etc who claims that only those who follow their faith, will be accepted by god.
In fact, I'm not religous myself, but I will say that some of the most ignorant, narrow-minded people I have ever met also claim to be atheists. Many of them seem to believe that rejecting and mocking religion somehow makes them an intellectual by default.