Not virtually all. All. We are trapped within our own minds and perceptions. We have no way of knowing reality exists or whether it is just our imaginations, etc. Even supposed impossibilities are possibilities. Everything is an act of faith in some regard. If to act on faith is absurd then it is useless to act at all or even to not act.To follow this reasoning is something that leads to despair. There is no reason for living. It all is meaningless. So, faith serves a purpose. It gives us reason to exist. Now acting on faith there are commonalities to which we can refer to as facts. We use these facts to reason, to find truth. Yet, they are still influenced by our perceptions. Everything is an act of faith. I live because I so much have faith in the "fact" that I am alive. This is carrying the reasoning to the extreme, but you have to do that with trains of thought don't you. Well, we think we do. The Truth; acting on these common view points, these facts, we attempt to use common reasoning (logic) to produce Truth. There are ways to deduce truth using this commonality, but even that is restricted to your perceptions. So, I believe in my faith, because I have faith in reality (or at least what I believe people to define reality as within their own minds). It all really is rather stupid to continue living at this point. As it is stupid to do anything. There is no right or wrong because there is no real truth. How's that for reasoning?