Immune to Religion
Sir Alexander Fleming, upon introducing his newly discovered drug, penicillin, warned against taking too little of it. An underdose, he said would permit germs to remain in the system thereby allowing one to build up an immunity to the drug. These immune germs could be "passed on to other individuals so that the thoughtless person playing with penicillin treatments may be responsible for the death of another" if not himself as well.
Something similar to this carelessness takes place in the spiritual realm where masses of people seem to be playing with religion - taking in just enough of it to become immune to the real thing. Many people attend just enough religious services to temporarily quiet their conscience; they attend just enough weddings, funerals, and special observances to keep them from longing for a genuine and thorough encounter with God who is so absent from their commitment. They have just enough religion to make them immune to the real thing.
Source: Attributed to Dennis Kastens, Echoes of Eternity, CSS Publishing Company, Inc.; in an email from eSermons.com on 05-26-08