Terry- I agree with your observation; it is true that beliefs are powerful and we all filter information uniquely in our own way.
However, I'm sure you would agree, beliefs only go so far as a guide toward truth.
I may firmly believe that the earth is flat- I have no doubt, I accept it my core. The hard, cold reality is beyond question however and empirically established by incontrovertible scientific evididence that the earth is, in fact, a sphere.
Continuing to believe with all my heart the earth is flat may make me feel better, but my beliefs are not doing me any favors nor are they enhancing my knowledge of life as it is.