Unless you are a true original in every sphere, then we can make a reasonable guess that the majority of what you believe lies within the known sets of human beliefs. Then from observing your actions and reactions to stimuli, (ie, your interaction on this board), we could extrapolate from there and make a reasonable guess on your beliefs on a wide variety of subjects. It won't be absolutely correct, obviously, but it won't be a complete shot in the dark either.
