Everyone agrees that we may project arrogance when disagreeing with another. The authors claim that the church has lost the loyalty of a huge number of people during our lifetime. Think of conversations with relativist thinkers. When we special plead, we demand special rules for our own argument but we are not willing to let the opposition have the same or similar special rules in their argument. In other words, once we say there are exceptions to laws like non-contradiction in one case, we must allow that other exceptions may exist in other areas.
Reason suddenly has no authority in defining reality.
That which is beyond my comprehension is not necessarily beyond someone else's comprehension. God, after all, comprehends everything - Realize that some theological formulations have historically been phrased as contradictory by theologians who placed no confidence in reason. Before accepting such formulations, make certain they are biblical and not merely traditional. Christianity is a personal relationship with God through Jesus Christ, and a relationship, to be personal, must be an experience. However, experience isn't what makes Christianity true.