This myTake makes a flippant, uneducated comment about Christianity. If you want to make a flippant comment about Christianity, then you should do so in an educated manner. Educated critiques of Christianity actually exist; use them instead of making stupid, needless comments that do nothing but make you look stupid.
1. Christian mythology is really a technical term and does not mean what you think it means.
Mythology is a collection of traditional narratives. Christian mythology refers to the collection of traditional narratives associated with Christianity. Unfortunately, the popular sense of the word is a bastardization of what the word really means. In popular culture, the word means "a collection of false stories". The truth judgment is added negatively. If you read the other myTake, then you'd see that the author views the quote as "mythology" and makes a point that even though he believes the quote to be "mythology", the quote does have some truth in itself, and he considers the quote valid enough to make his point about politics.
There are some things wrong in this picture. First of all, the author is neither using the popular nor the technical definition. What he calls "mythology" is really "theology", but he believes that "theology" is foolish or false, so he uses the term "mythology" to inject his truth judgment. Second of all, the author seems to be reluctant to accept that Christianity can offer truth.
This is what he said:
While this refers to Christian mythology, this is something that applies to many things beyond morality, voting included.
The contrast in that remark highlights that the author does not want to find truth in Christianity, probably because he presumes that Christianity is false and therefore it cannot be true in any way, but nevertheless he finds that what C.S. Lewis says about Christianity has some grain of truth and can be applied to different topics.
Perhaps, the author's prejudice of Christianity stems from the fact that anything supernatural is false, and therefore the theology based on the supernatural must be false as well. However, I believe this belief grossly misunderstands what theology is really about. I interpret theology as not about deities or the supernatural, but about human interpretation and perception of the supernatural world, regardless of whether the supernatural actually exists. Even if the supernatural world is not distinctively different from the natural world, that still does not change how humans feel or behave. After all, Christianity and other religions are part of the humanities, and many subjects in the humanities study the various aspects of human nature.
2. Be aware that anybody can be a Christian.
Too many people assume that Christianity has one set of rules that you have to follow or one set of beliefs. In reality, there are many Christianities, and each Christianity has a unique history and theology. Christianity is a very evangelistic religion and has been adapted by many different societies. Each society takes Christianity and adapts it to fit the needs of the people. For example, Lutheranism, a branch of Christianity developed by Martin Luther, was not only a theological movement, but also a political one. Martin Luther was German, and so he found support among the German princes who wanted to break free from Rome's political power over the Germanic states.
I contend that one reason why people still believe in Christianity is that they do find truth in the religion, and that truth is entirely relevant to their experiences. To say that theology is just about the supernatural without any humanistic experience tells me that some people just don't give in the effort to understand why Christians make a confession of faith. Instead, they make their own biased assumptions about Christians rather than forming an educated opinion based on what they observe in Christian thought and behavior. I don't know about you, but I find that making biased assumptions about a group of people is counter-productive, harmful, and unempirical.
3. Study Christian theologies.
If you want to criticize something, then you have to know the subject and look for weaknesses. Believe me, there are plenty of weaknesses in each theological tradition of Christianity. Sometimes, a particular theological tradition just does not jibe with one's own experiences or educated interpretation of the Bible.
Although many Christians believe that the Bible ultimately comes from God in some way (key word is Biblical inspiration), the secular approach in finding the authorship of the written words or ideas is an ongoing research field. Scholarly questions about authorship of the Bible do not necessarily undermine the theological standpoints of Biblical inspiration. If a section of the Bible is written by Person X, then that still does not say anything about whether Person X is directly controlled by God to write it word for word (dictation) or inspired to write it using his/her own words (limited inspiration).
4. Study the history of Christianity.
Christianity is a very old religion. I believe that if more people were to study the history of Christianity, then they would appreciate how the religion impacts the world positively and negatively and why people believe. A long-lived religion must be able to adapt to the times. If the religion is irrelevant, then why does it matter anymore?
If you do all that, then you would take criticism to a whole new level. Stop being a troll; be a critic. And use proper, standard vocabulary. If you want to be a skillful communicator, then you should know how to avoid words that only you understand. Words that mislead or inject undue personal judgments into a neutral concept help no one.