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Well... anything people do is ultimately based on beliefs, or assumptions. Even the most rational, logical, skeptical and science-minded is acting upon assumptions: the assumption that the reason, the logic and the science are THE right way to understand the things. But its only an assumption. Logic is only a way to relate things assumed as true, but it cant justify itself.
Logic just says "if x is true and y is true then z also must be true", but the fact x or y are true are only assumptions. And even when they are derived from other assumptions, like "if a is true and b is true then x is true", there are this assumptions a and b which were assumed to be true. This process can be repeated as much one wants, but always there will be assumptions that are not justified, but only assumed to be true. So, all the statements derived from logic are also ultimately based upon beliefs, or assumptions, and it makes them no better than any other beliefs or assumptions, logical or not.
Well... i personaly dont believe that the "spirits" are the souls of the dead ones. I believe the dead ones cant return to this physical plane we live. But, i also believe that there are a lot of other non-physical live beings that exists and sometimes are percieved by people.
Well... if you accept the possibility of colletive hallucinations, how do you distinguish the "reality" from a collective hallucination? How can one know that we are actually percieving the world as it is, instead of having the same hallucination of everybody else?
The thing about logic is it appears to work. In order to function in the world we agree that a car speeding along the road will break our bones if we step in front of it. <speeding car> + <unwitting pedestrian> = <bloody mess>
You can create an internal reality that makes spirits function but that doesn't mean it will function in the outer reality. Thinking in a system other than logic might change the outer world but at this moment in time if you want to get from A to B you have to do it in the logical reality world.
I don't accept collective hallucinations. I accept that the brain structure coupled with experience may have similarities just like cutting the skin makes us bleed.