"Kurt Godel's Ontological Proof" is a notable example of an attempt to prove that God's existence is possible. Atheists have used an equal amount of arguments, including the use of Occam's Razor , for their case. However, neither the theist nor the atheist factions have had a decisive advantage in proving or disproving the existence of a divine being, resulting in both sides believing on faith.

• Many atheists claim they 'know' and do not 'believe' or 'have faith' that there is no divine being. However, their behavior, reasoning, and actions clearly show otherwise.
• Belief is considered propositional in that it is an assertion, claim or expectation about reality that is presumed to be either true or false (even if this cannot be practically determined, such as a belief in the existence or nonexistence of a particular deity).
  
• Faith is the affirmation of belief without an ongoing test of evidence, and even despite evidence apparently to the contrary.
• Knowledge is understanding or being able to do something. The things we know are facts, truths or information.
• Based on this, both atheists and theists support their religious positions out of faith and believe they are true without basis of knowledge, because no conclusive rational or logical evidence exists to prove either's case.
• In the case of explaining how non-existence of a divine being must be proved through evidence, it is more in the conclusive destruction of theist evidence, which has failed to happen save for in the minds of the most self-convinced atheists themselves. Again, mere absence of evidence is not evidence of absence.

There are atheists who have converted to theism. If arguments used by atheists were so conclusive, obvious, and absolute, very few atheists would become theists (especially among atheist philosophers). Case in point, Anthony Flew, a former atheist philosopher and activist with many well-published books arguing against theism, is one such person who renounced his atheism. Another example is C.S. Lewis, who was a staunch and militant atheist for much of his youth (insisting that all religions must be called 'mythologies'), but converted to Christianity in the 1930's and wrote many books defending it from atheism.

For militant atheists to claim their beliefs are "rational" and that theists are delusional/irrational/ignorant/insane/unintelligent, therefore, speaks much of their own irrationality and close-mindedness, in their fanatical devotion to something that is so vague and inconclusive from a truly logical and scientific viewpoint.