What is the difference between ancient Christianity, medieval Christianity and new Christianity?

Christianity is a general term, Catholicism is the early name of Christianity, and orthodox Christianity was divided into Catholicism and Orthodox Christianity after the Roman Empire was divided into two parts.

Later, under the banner of saving the eastern brothers surrounded by pagans (Islam), the Crusaders burned, killed and looted all the way for hundreds of years. Later, they even fought against their brothers (Orthodox Christians). The reason is plundering wealth.

Protestantism is a different form of Christianity and Catholicism after the bourgeoisie sprouted. Some people think that if you want to prove that you are the son of God, you must work for work, work for labor, and not work for enjoyment. Therefore, this is exactly in line with the early stage of bourgeois development, which requires the primitive accumulation of capital, that is, expanding capital investment for reproduction as much as possible, rather than using it for personal luxury consumption as in the past. Therefore, this is why Protestants see that losers have no compassion, because failure means that they are not God's voters. This religious and cultural thought has also created the whole social atmosphere.

However, this is a pure concept in the early stage of capitalism, which deteriorated in the later stage. For example, Puritans paid attention to it in the early days of the United States, and later, especially in modern times, they advocated encouraging early consumption and excessive consumption, which was far from the early thoughts. Causes the depletion of the earth's resources and other problems such as resource society. This is also the aspect that western European countries oppose the rapid economic development, thus ignoring the enjoyment of people's spiritual life.