Most people believe in whatever they want to believe in and they disbelieve in whatever they want to disbelieve in, usually with no actual work or investigation of any kind at all, but merely by a brief jerk of the knee. ;-) The beliefs they have were normally acquired from their parents, their society, their teachers, their peer group, the books they're read, and whatever else they've been exposed to in their very brief sojourn upon this Earth.

Like parrots, they are terrific at repeating what others have told them.

And they will yammer at you all day long about it, because they'd like you to believe the same things they do.