Christians like to believe that their religion spread around the world by people voluntarily abandoning their own cultural traditions in favor of the obvious superiority of Christianity.
Actual history shows that’s not what happened.
Christianity spread around the world first at the point of a sword and then at the end of the barrel of a gun.
Starting with the Roman Empire and continuing through European colonization, Christians used military power and brutal oppression at the hands of authoritarian governments to force people around the world to adopt Christianity. Those who refused to worship Jesus were tortured and killed.
Violent Christian Nationalism is nothing new.