No. My beliefs are based thusly:
I think, therefor I am.
I have access to a perception of the universe, which must exist either independently, or as an aspect of myself.
Anything I can observe directly or indirectly must also exist thanks to the above line
Anything I cannot observe cannot be definitively said to exist or not, and any such concept is as valid as any other really.
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MMBN style fighting game made by me in the link below!
http://sandbox.yoyogames.com/games/184947-b8bn