I never would have guessed, I watched some of your videos with @piedpiper and I actually thought from how well you spoke English that you were an American migrant to Germany.
In that case, this is a little off as well:
Humans are cynics and instinctively doubt anything that disrupts their current belief system.
I think you mean "skeptics", since cynics are people who believe that other people are generally selfish, while you're talking about an approach to new information. But even then, I would use the phrase "generally closed minded" rather than either of those.