SO WHAT ! ! !
Just because a group believes something does not make it so; Logical fallacy: Argumentum ad populum - appeal to popularity/bandwagon - everybody is doing it!
1 : loyalty and devotion to a nation; especially : a sense of national consciousness exalting one nation above all others and placing primary emphasis on promotion of its culture and interests as opposed to those of other nations or supranational groups
In my opinion, not a particularlyly good thing in view of what these sorts do, which takes us back to Orwell...
So what? So you were wrong it's not only my opinion but an opinion shared by hundreds of millions.
Tell me are you a practitioner of faith? If so, which faith?
That may we be your definition of what a nationalist is, but I've already given you my thoughts, which isn't too far off from Merriam-Webster's definition.