As somebody brought up in the Catholic faith, I can assure you that all humans are exposed to varied ideas and alternative books that they can make their own mind up.
Diversity of opinion for me increased after I left school, and that's when I became more critical of the beliefs I held as a child. It's for that reason I think libraries are better than social media - social media is not just the equivalent of a religious tract that insists it is true, it actively prevents you from finding and considering contrary views all by yourself.
On what basis can they do this? No human is born with a magical algorithm in their brain that can sort good ideas from bad. The only scalpels we have are those which we collect. Critical thinking must be bootstrapped. Mind viruses must be inoculated against. Just because you (eventually!) threw off your case of memetic measles, doesn't mean that everyone does. Some people die of it.
Diversity of opinion for me increased after I left school, and that's when I became more critical of the beliefs I held as a child. It's for that reason I think libraries are better than social media - social media is not just the equivalent of a religious tract that insists it is true, it actively prevents you from finding and considering contrary views all by yourself.