I don't know anything about this open-mind nonsense. That falls short whenever you're prompted by others to take up extremist, prejudiced, or illogical ideas you can't accept. Clearly, there is a point where you have to draw a line, even when your stance is complete neutrality.
Anyway, when you judge people, the best thing you can do is to do it fairly. Do it on a case-by-case basis, because people exist as individuals and not as groups. They can't help—as individuals—the standard or image others might make for them. Exceptions exist. People born now don't necessarily agree with what their country believed fifty or a thousand years ago. The public image is not necessarily the truth.
You ought to realize it yourself since you said you try to befriend people despite the prejudices in your mind. At least, for that much, I don't think of you as a bad person.
Then yet again, I never took you seriously because of the god bless thing in the first place but w/e.
inb4 do not judge lest you be judged