The Catechism of the Cathoic Church is 825 pages long. That's long, but not unimaginable. We are talking about the teachings of Christ's Church on earth.
Then again, the Catechism doesn't exhaust all of our knowledge about our faith. How could it?
The faith is simple enough for a child to grasp (the Golden Rule), and deep enough to drown an elephant (St. Thomas Aquinas).
Well it isn’t yet on the order of magnitude of the Jewish Talmud and what they did to the Old Testament... but give it time