There are thousands of different religions, philosophies, and political ideologies worldwide and billions of homemade beliefs and worldviews. Scientists also speculate and assume. They can also make mountains out of molehills. They wouldn't have much to say if they were only to discuss what they had clear, irrefutable evidence for, much less write voluminous books. They don't know how the universe came to be, how life originated, whether life exists on other planets, what consciousness is, what electrons and quarks consist of, etcetera.
We don't know where we are coming from and why we are here. We make assumptions and create hypotheses, conduct experiments to find proof, pray and meditate, and become convinced that we finally have it right — but we don't. We later understand that we were wrong. So we try again. We can't live without phantasies, stories, assumptions, and beliefs. To be human is to live in a virtual reality. This is our habitat. It's not possible to live in "the real world." It's like fish who can't live out of water.
However, aren't some religions and ideologies worse than others? Is not nazism worse than socialism? Is Baptism not better than Wahabism? Is not the scientific standard model better than The Old Testament?
Who shall be the impartial supreme judge?
And what about hallucinations? People with schizophrenia, for example, can see things that don't exist in the real world. And deluded people believe in things that are crazy.
And what about Fake news? Both social and mainstream media disseminate lies—and truths.
The idea that the truth is what is the truth for you is not the truth.
Reality is not what you think it is.