////Of course you can change your beliefs./////

I didn't say you can't. I said you don't change your beliefs on a whim. You don't decide to worship Adolf Hitler for the hell of it. Something had to have happened that forced that change in you.

////Of course you can make them up. People make up new beliefs every day. That's why we all don't think the Earth is on the back of a giant turtle or that the sun doesn't die every night to be reborn at dawn.////

That displays a complete ignorance of the mythmaking process but that's another thread.