The Roman Catholic version of Christianity WAS Christianity, for more than a thousand years. It wasn't until the Second Millennium A.D. that offshoots of Catholicism began to pop up. I'm a little out of my own specialty here, but I'm pretty sure that the Greek Orthodox version of Christianity was the second one to take hold. But then, as the millennium proceeded, other branches of Christianity began to pop up. The Anglican church (more formerly known as "The Church of England") became the official religion of England (another Protestant version of Christianity like the Greek Orthodox, which was spreading all over the eastern edge of Europe and into Russia), while almost all of the other European countries maintained Catholicism. The Church of England is still the "official" religion of the U.K., but the country no longer has a monolithic population, so there are lots of people living there who belong to other churches... not to mention the growing Muslim population and, of course, the Jewish people who have been there for several centuries, as the Europeans on the continent never really got along well with them and were happy to see them go. (Perhaps you remember a nasty little event that occurred during WWII, called "the Holocaust"?) And, of course, Catholicism was not able to maintain its monopoly on the European Christians. Today there are several major countries where Catholicism prevails (notably Spain, Portugal, France and Italy). Vatican City, of course, which is the headquarters of the Catholic Church, is in Italy. As to your question about Asia and Africa, the answer is, essentially "yes." Asia has never become a major Christian civilization, because there were already quite a few other religions there... both ancient ones like those in India, China, and Japan, and of course Islam, which is centered in southwestern Asia. There is also a huge Muslim population in Africa, although many of the African countries also have large Christian populations. Judaism arose in Israel long before Christ's birth, and the modern State of Israel, which is on the shore of Asia, is still the religion's homeland.