Very good points, but people tend to cling to beliefs that they fear the consequences of or to what brings them comfort from the fear of death. Fear is a strong motivator. After excepting the hope and glory of eternal life it is hard for most to turn away into the light of knowledge when there may be a faint glow of hope that they can be with their loved ones after death. One cannot disprove the absence of something that does not exist. Therefore people are willingly caught up in the net of false beliefs.
When the irrational can be supported by some form of random misconstrued evidence the belief takes on a power of its’ own. So how do we combat ignorance? By education and the hope that people will develop and use the skills of critical thinking.