Humans must breathe in the air of our atmosphere to survive. Many cities because of pollution face a dangerous level of contamination in their air. However, an even more deadly air affects both Christians and nonChristians. Ordinary methods or devices cannot detect this poisonous air. The apostle Paul, in his letter to the Ephesians, spoke of the "air," when he said that Satan was "the ruler of the authority of the air." (Eph. 2:2) In that, very same verse Paul said the "air" is "the spirit now working in the sons of disobedience." If we breathe in this "air," we will begin to adopt their...