While thinking can lead to radical self-discovery and freedom for a few people, for most it remains an unused opportunity that creates uncertainty rather than clarity.
If one assumes that each person constructs and interprets their own unique reality, then the idea of a truly shared belief seems questionable. Even when people use the same words to describe a belief, their subjective meaning, motivation, and interpretation can vary greatly.
The key is the willingness to detach yourself from external influences and have the courage to explore your own world of thoughts without fear of the judgments of others.