An enthymeme is an argument in which one of the premises or the conclusion is not explicitly stated. Usually, this is because the unstated claim is obvious. Enthymemes are perfectly acceptable if used properly. But sometimes, they can be used incorrectly to draw a false conclusion. So, understanding enthymemes can be extremely useful in apologetics.
One of the most important tools in logical reasoning is a dictionary. Correct reasoning requires that we use words properly – according to their meaning. Failure to use words correctly often results in miscommunication, but it can also result in errors in reasoning.
Is the Christian faith illogical? Critics allege this of course. But surprisingly, many Christians also say that biblical faith is illogical, contrary to reason, and yet that we should hold to it anyway. Some would say that faith by its very nature is contrary to reason. Others would say that the core principles of the Bible defy logic: principles such as loving your enemies, that Jesus is both God and man, that we should rejoice in being persecuted for Christ’s sake, and so on. How are we to handle such claims?
A thorough knowledge of logic can be immensely helpful in our own reasoning, or when reasoning with others. But in addition to any pragmatic advantage, we have a moral obligation to be logical. Thinking rightly is not optional for the Christian. It is something God requires of us.