That time period was as many people call the dark age. During that time Catholics dominated Christianity. They called themselves Roman Catholics; and they adopted much of what the Romans had adopted(which was corrupt). In that time the priests were the only ones that had acsess to the Bible. The services the they conducted became shows. The songs and sermons were in Latin(only the "highclass" knew latin; and the high class was made up of the priests). It was not until The Renaissance(1350-1600) that the Bible became acsessible to the public. John Wycliff(c.1329-1384) had the Bible translated into English. It was not until Johann Gutenberg(1400?-146
invented the movable-type printing press(1440), that the Bible was able to be produced unless written. Gutenberg printed his first Bible in 1456. This was called the Gutenburg Bible in his honour. By 1500 when the Modern Age began, there was an estimated 9 million books in Europe(including the Bible) in contrast to a few thousand before that time.
I can't tell you exactly when the Christianity that is around today first made a comeback from the Dark ages, but I can tell you this if someone does mass killings or illeagal stuff, and claims to do it in the name of Christ, they are DEAD wrong. If God said to kill people in His name then everything would be off. They Bible states all over it that we are not to kill and that we should obey the law. He knew we would mess up, though. That is exactly why He sent Jesus Christ.
And one more interesting fact. They Bible is the most stolen book in the world.
Islam Actually rose in A.D. 600. The Egyptian civilization began between 2300 & 2200 B.C.. The Greek City-states rose in 700 B.C.. The Latins established the Roman Republic in 509 B.C.
Another interesting fact. One of the books of the Bible was written in 535 B.C. This was written by Daniel who was near his death. He, through God, prophesied that Rome would rise. "And the fourth kingdom shall be strong as Iron." Daniel 2:40 You can see the Babylon empire as No.1, you can see the Persian empire as No. 2, you can see the Greek empire as No. 3 and you see the Roman empire as No. 4. Daniel wrote this nearly 100 years before it happened.
Respectfully,
Wes