If you are a Christian, you are a tourist in this world. Your country is not here. You have no country. You are not called to conquer or build a country here. You are a sojourner. A wayfarer. A traveler. An ambassador.
Your possessions, your money, whatever earthly citizenship you have is only in your possession so that you can effectively use them to help others with acts of compassion, charity, kindness, justice, and mercy.
That objection of nationalism you feel is from the world system you were born into and taught.
That objection to the nature of your possessions and wealth? That is also from the system you were taught and born into.
You own nothing. You possess nothing. You have no real home or nation here.
That is the life you were called to if you took upon yourself the name, “Christian.”