What's Wrong with Pope Francis's Encyclical Letter?

On July 5th, Pope Francis issued his first encyclical letter: "Lumen Fidei" (Light of Faith). It is about the Roman Catholic faith, and it is addressed to Roman Catholics, not to non-Catholic. But non-Catholic Americans should be alerted to a certain passage about supposed certainty. This claim to supposed certainty can inspire the Roman Catholic bishops in the U.S. to be even more combative about the church's moral teachings.