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why?

calvin is a cartoon character.

And the greatest theologian of the Reformation. So, as an historical figure very important. Max Weber is also somewhat important in our today's society since he is the father of sociology.
Furthermore the Gospel is very important since it changed the whole world.

I'm interested in belief systems in general. But, in the case of Christian sects, I like learning about them because of their place in the history of Western Civilisation.