It is quite extraordinary to me that some people hold collections of unfounded beliefs while denying fact-based realities. I suppose that these alternative "thinkers" believe that it is better to hold as true that which they wish to believe, and as untrue any fact-distorted information that they choose, for whatever misguided reason, not to believe.
Here are some ridiculous world-views that I have encountered in some illogical and personally unpleasant (for many reasons beyond ridiculous beliefs) individuals:
B (for Bible Biased Bigot): God, also pretentiously called the "Intelligent [sick] Designer", dictated Absolute Moral Truths. All liberal and compassionate views, including tolerance of others' behaviors, and any behaviors that differ from the straight and narrow will lead to inevitable moral mayhem. B's knowledge of sociology ranks with B's level of empathy and compassion somewhere close to zero.
W: Global warming is a myth. W's "reasoning" runs that because the planet has previously had ice ages, then global warming must be attributable only to normal fluctuations. Knowledge of the existence of prior ice ages is the sum total of W's knowledge of paleoclimates and climatology. W finds scientists dull because they say the same things as one another. (I think that the planet would be a very scary place if all scientists concocted ideas based on a personal need for variety!) W knows virtually nothing about medical science, but firmly believes that most disease is a creation of the mind. The Nazi holocaust, according to W, either did not happen or is greatly exaggerated (the latter being a concession to the horrifying film footage). W believes that Jews have exaggerated the holocaust because they suffer a persecution complex. It does not seem to have occurred to W that the Jews have indeed been scapegoated and persecuted repeatedly during European history. W doesn't believe in God (so far, so good) and so does not believe that Jesus was the son of God (fine, since a man cannot be the son of something that does not exist). However, W considers that Jesus the man is a myth and that Jesus never lived (apparently, the Gospels are utter lies rather than exaggerations). Does W the-fact-buster believe in anything? Yes, W believes in the sort of mythical creatures that exist only in fantasy novels .....
There seems, as evidenced by these two, to be an association between truly silly or nasty belief systems and more generalized personality defects. This makes some sense in view of the fact that our personalities are the outward manifestation of our general belief system, and further, that what we choose to believe, when we diverge from evidence-logic-based beliefs, will be greatly influenced by our temperament and general attitudes to the world and others.