Why should everything that exist in Europe/america be called a Christian thing????
Should a geographical feather like Alps be baptized simply because it is located in Europe????
So people in Balkan are Christians simply because they are Europian?????
Some group like TIA say that siting on the ground vs. siting on a chair is a matter of religion. Are they jews? why should such external things matter for God?
The mentality you describe would have been incomprehensible to the Christians of the Middle Ages and Late Antiquity, because it is made up of a set of attitudes that came from the "Renaissance" (rebirth of what ?) and "Enlightenment," which came to be universally accepted and taught in Europe and North America for the past several hundred years, but especially with the rise of the eminently hateable middle class. It is nothing but worldly vanity, especially considering that at the time of most Western contact with the natives of America (both North and South) and East Asia, the Westerners themselves were in many ways removed from the Christian traditions if their ancestors and scorned things in the natives that were actually cherished by their forefathers, such as loving and preserving God's creation and different habits of bathing, eating, and dressing. In the Middle Ages and earlier, however, Christians of the West ere more robust and innocent, and they interacted with other nations in a more balanced way, truly living as if the Church is universal. TIA is notorious for their stupid, bourgeois attitude, and I consider them a public embarrassment. I encourage you to do the same and not take scandal from them; know that some of us Westerners often make jokes about that website's ridiculous teachings, such as their claim that it is un-Catholic to let dogs lick your face, to not use late-XIX c. table etiquette, to unbutton your coat (which of course must always be worn), to not bathe every day, or to sit on stairs, haha. They're not Jews, just Anglos.