Here's a site which discusses this: http://www.askwhy.co.uk/christianity...ng.php#Culture

Some notable quotes:
"Christians try to deny that, when they achieved total power at the end of the fourth century, they ravaged the Pagan learning accumulated over the whole of previous history. Since this vandalism started the Dark Ages, it is quite difficult to prove, simply because the destruction of learning meant there was little recorded evidence about it that was not written down by Christians—the few left who could write."

"Christians [claim that they] tried to preserve classical and Pagan works, and it is because they succeeded so well that we have them today. That claim is belied even in the New Testament itself where in Acts 19:19, Christian converts burn magical books worth sixty thousand pieces of silver!"

"once the church leaders got control of the publication of books, they launched an all out destruction of any literature they did not like."

"the fourth century was when the Roman branch of Christianity gained dominance over most rival branches, including the remnants of Nazarene “Christianity”. They began to persecute these rival churches and destroy their manuscripts."

There are many, many more. One thing to remember is the old proverb, history is written by the winners. Since almost all of the history of Europe we have from the founding of the Holy Roman Empire has been filtered through the Church, it is understandable that documents which conflict with Church teachings are hard to come by. But they do exist, and they have been turning up to contradict the Catholic histories.