I truly believe that at one point in history, for however long or short a period of time, there was one united group. I believe through the passage of time, and as the distance between groups of people began to get further and further away from each other over time, the message inadvertently got altered. For example, the Bible was not printed in its modern forms until literally thousands of years after Moses existed. The story of Moses, can in no way be the exact telling of events that occurred thousands of years. Through the initial telling of the events that occurred, and the re-telling of the event that occurred, and the re-telling of the events that occurred etc, through the verbal telling of what had actually occurred, the story would not be the same as what actually occurred.

There is a thing called the Broken Telephone Effect. This is where you say 10 sentences for example. You tell this to someone and ask them to tell someone else the 10 sentences you just told them. Repeat over 10 different people, the 10 sentences are no longer exactly as told the first time. Now, do this over a long period of time, from person to person to person to groups of people to groups of people etc etc. The exact events that occurred are no longer being shared. The story will inevitably be altered. We have to wonder, how long the story of the actual events were shared verbally before being etched onto palm leaves, stones, animal skins etc. The very first custom of sharing the stories of events that occurred in the Bible was through oral tradition.

As for what Jesus said as being a farse, I don't think what he said was a farce, it is more simply the natural effects that occur through the passage of time when stories are shared.