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The Catholic Church in the U.S. changed from Latin to English, many years ago. As for the rest of the world, I sure don't know but I would guess that the mass (the Church's MAIN celebration) is celebrated in the native tongue of most countries. Obviously much Latin is still maintained in the Vatican, the Church's headquarters, but like I said, I have no idea about how the masses are said in the rest of Italy or the other countries. And by the way, it is NOT just to make it interesting, because over the last how many years, it has NOT changed. Part of it (epistles, gospels, etc.) change daily, but the overall makeup has not changed. Even these epistles and gospels repeat each other year after year. As a youngster, I had the Latin responses, or words the altar boys answer to each of the priests sayings or pleas memorized, and thus it was rather common to speak and understand those words. Later on, when the Mass changed to English here in the U.S., the words were an easy substitute for me, but probably more enjoyable for the whole congregation, since their mastery of the Latin was certainly not a requirement.
When you talk about how Hollywood re-enacts the stories of the Bible, you should also realize that Hollywood's business is entertainment and they are not bound by any rules of accuracy or perfection. You also say that in the olden days they had a lot of superstition and fears of the unknown. You are correct and that is STILL correct today. Just look at the movies about space aliens, ET, wars of the galaxies, etc. Should we be blindly accepting these stories? When the unknown is finally discovered, it is no longer an unknown or a fear, or cause for superstition. And if you blink your eyes, there will always be something new to replace that old fear or superstition.
Finally, let me address your point of "why did the main guy never write anything?" My belief is that He did. He inspired 4 men who lived during that time, and maybe more that we are simply unaware of, and their individual accounts are quite close in content and meaning. In fact, I would say more so than maybe 4 different reporters from our National News Media might offer their individual reports on one specific incident in our country, like the September 11, Twin Towers disaster.