Without nationalism, we would not have any nations. Do you think USA should be abolished, or Afghanistan, or any other nation? I think it is repressive, intolerant and authoritarian to force everyone to be the same, that is why I think nationalism is good. Obviously I would not want to be part of all possible nations, but I think people should have right to have roots, heritage, history and way of their own, which I think nationality and nationalism is essentially. I think it is very important also for liberty to have many different nations, because it gives opportunity for choice and protects people from oppression that will come with one world government without nations. Nationalism protects people's way of life, which is why I think it is good.
Every human is one step a way from fascism. All people can be fascistic, even if not nationalists. Today biggest fascists seem to be the "antifa" people. Nationalism is no more fascistic than any other idea. But, nationalism and any other idea can be used for fascistic purposes.
"America is supposed to be a land of liberty and justice for all". I think that is American nationalism. And I think it is based on Christian principles and worked well, when majority of the people were Christian. Now America doesn't seem to have liberty nor justice and I think it is because people are not anymore Christian.
I don't think people should be forced to accept everything, which seems to be the opposite of "Christian nationalism". People should have right to be intolerant. If people are forced to tolerate everything, it is authoritarianism and repressive.