Belief systems for me are about what's fun, what's useful and what's interesting, but not about what immediately appears to be true. For instance, I feel no need to believe in the existence of the bed that I'm sitting on, but might chose to believe that it doesn't exist for a while and see where that thought leads me, if I am going through the subjective/objective reality problem in my head.
In other words, belief for me is nothing to do with the things that I feel that I 'know' at any point in time, however it is often the first step in finding out that I don't 'know' as much as I thought I did.
I believe all sorts of things purely for the sake of argument or conjecture, I sometimes believe that Jehova could very well exist but be one of the early human group conciousnesses instead of a god, and just thought that he was a god untill fairly recently. I worked this all out with a friend of mine into an nice Darwinian explanation for the evolution of Jehova and found that if you take this perspective, the book of genesis makes a lot more logical sense. (me and my friend were smoking quite a lot of weed during this period)
I know that this belief is most probably the biggest load of steaming horses**t that the world has ever seen (barring possibly the official
explanation of the book of genesis). But I will continue to believe it occaisionally until I find something more fun, useful or interesting, or someone gives me a rational analysis of this belief and points out a damn good reason why it is not true. Other than "You what? That's the most ridiculous thing that I have ever heard".
Beliefs are not to me how we define reality, they are how we explore it.
We are currently living in an age where Sandia JPL are talking about the possiblity of doing a test of antigrav and faster than light travel within 5 years
where people think they can finish building a lift into space within 12 years
where we can already obtain a nanotechnology material like rubber metal
that conducts like copper and is made of virtually nothing for virtually no money,
where large goups of people regularly socialise and communicate using ghostlike avatars existing in digital realms like Second Life
where war is being fought in the Lebanon by semi-autonomous robots
on behalf of an ancient god in attempts to fulfill prophecy
and where private individuals fly into outer space using recycled tyre rubber and nitrous oxide
These are not products of of a world of fixed belief systems, and some of them are at least as ridiculous and unbelievable to a lot of people as believing in alternate versions of Jehova...
Believe whatever you like and change it regularly, just don't believe that it's true...