Humans share one singular belief that is unquestioned: universe is a logical construct that can be understood by mere human agency. Even modern "atheists," who perceive the universe through the foundational prism of chaos and chance, adhere to the above universal belief/dogma. All knowledge has basis on principle statements that can not be tested or proven. Humans operate on deductive reasoning and only play at inductive process.
Everything we do is based on probability of events as far as we know as knowledge itself can never be complete. This is what makes claims of certainty as to the way things are or will always be quite absurd, don't you think?
I am certain in my certainties of this universe, as you are certain of the uncertainties of this universe. I am zealous regarding my beliefs, as you are convicted of your unbeliefs.
Certainty ends all dialogue as there is no room for movement beyond it. If I can convince you otherwise, you were never certain. If you can convince me of your certainty and I become certain, why speak at all?
To choose uncertainty and skepticism as a philosophy of life is akin to choosing immobility as a means of transportation. At some point, man must leap to choose certainty of a belief and a belief system that provides reference for his life. If nothing is certain, then there is no purpose to any conversation. Those who live in certainty use data gathered to refine their matrix, not overturn their foundational beliefs.
That doesn't make sense to me.