Well, you're completely right in the sense that if belief x is present, then manifestation y is possible. I don't think there are beliefs that don't impose any limitations. I can't possibly believe someone can become invisible with the power of a magical stone, o that communism can work, for example, and I think I have a rather "open minded" outlook on life. What you may find, as you say, is that some beliefs allow for more manifestations than others. Being a neo-nazi won't ever let you fully enjoy the wonders of jazz or practice judaism, it limits you more than, say, being agnostic.

What I believe, however, is that we aren't bound in place by those beliefs, we are those beliefs, and those beliefs change and evolve as we experience new things, react to new stimuli. I'd accept calling them a prison if, like robots, they were unchanging and set by someone else. Being that they are born from ourselves as we are born from them, I don't really feel it's accurate. They're not an external force, like the dogmas of a hardcore Christian family may be for a child, but something that grows with us.

It may simply be a matter of perspective, to be honest.