The reason it is called faith is because it is something that can not be proven. You have no proof that there isn't a God either. It is your faith in the secular world that makes you an unbeliever but it is faith nonetheless. We are just at an impass, your faith vs mine and we shall not know the outcome until we are both gone.
Maybe it can be proven in the future or has been proven in the past, but scientific proof is not available to us at the present.
While a god (supernatural being) has neither been proven nor disproven, as is with dark matter, the existance of one or more does make logical sense. The fact that science follows a series of rigid laws could mean that they were intelligently designed into out universe. Or that they came about at random, and our particular universe out of a near infinite number had the right set of scientific laws for life to come into being. But the creation of our universe required energy and a catalyst for the big bang to occur, which does point to a supernatural intelligence.