Give the Catholics some credit. They had the only game in town until a whole lot of people learned to read and write. Then the Catholics gave them something to read, write, and argue about.
This not about grace or rapture or any of that rot. It’s about ONE truth that Christ taught, a Commission given strictly to Peter and his successors, and was founded on One Church. That Petrine authority that assembled the books in the Bible did not fly out of the window eleven centuries later with the curse of the Reformation of 1517 that has provided us with 30, 000 different and conflicting sects of Protestantism from David Koresh to Billy Graham and everything in between.
Apparently, by your lights, every Tom, Dick, and Harry, and Rev. Jeremiah Wright, the Moonies, the Jehovah’s Witnesses, the Rapturers,and every two-bit neighborhood pastor of the local Foursquare Church can crack open the pages the Bible and offer there “own” interpretations of the Bible.
This is possible only because there are large shoals of fish that swim in shallow theological waters ready for easy bait.
Before you attack Catholicism, perhaps you may like to really ask why a universe of serious intellectuals from every religion, atheists included, and every discipline of science and arts who after careful study and examination have CONVERTED to Catholicism.
http://en.wikipedia.org/wiki/List_of_converts_to_Catholicism