Christianity did not survive the second century. Mormonism did not survive it’s third decade. The answer to the question ‘why’ is the same: Both became more interested in getting economic gain, power over the flesh, becoming popular in the eyes of the world, and infatuated by the lusts of the flesh and the things of the world, than in practicing and preserving the faith taught by Christ. The Book of Mormon describes the corrupting influences infecting churches.