
Thus demonstrating the inherent flaw in belief systems.
Only in those who refuse to question them. We actually have beliefs about everything (e.g. I believe following the science is the appropriate approach to addressing things like global warming).
A lack of critical thinking (which may be what you are saying, and is symbolized in the cartoon) is indeed a problem in a large group of people, however. But it is that lack of critical thinking - rather than beliefs per se - that I think are the problem.
Personally, I try to keep tabs on what I believe, and I change beliefs that don't continue to fit what there's evidence for, even if those beliefs have been with me for a long time.