All of us are shaped in many ways by unseen markers in our DNA. Unknown ancestral traits contribute to determination of such things as eye and hair color, height, and even a certain propensity or susceptibility to certain diseases. To some extent religious bodies are similarly the product of their beliefs and doctrines, at times and in certain ways, to beliefs and doctrines buried in the inherited make-up of that body or denomination. Landmarkism is such a genetic-like marker in the Southern...