Yet Another Conversion Story~

[Purple Rabbit]

I think you could understand Humanism and Totalitarianism as they don't require possession of belief in them to understand them, as Christianity, in part, explicitly does. The rest I don't know.

Fact is that you haven't experienced any of them from within, so according to your own standard you can't give any substantial judgement.

According to my standard anybody equipped with the faculty of reason is in principle able to give substantial judgements. For instance one can assess alleged world views if they allow critical thinking and independent truth finding or primarily are based on dogma. That should give you a first rough idea of what you're dealing with.