This N-Gram analyzes different words associated with apologetic reactions to modernity. By analyzing how popular each term is, we can infer their popularity. Theodicy refers to the philosophical problem of reconciling an all-powerful, all-knowing, all-good G-d with the existence of evil. Fundamentalism is a movement that emphasizes Biblical inerrancy expressed through devotion and social orthodoxy. Christology is the Barthian doctrine that outlines Christ as the mediary between believer and G-d.  Moral relativism is the idea that truth is not absolute, but shaped by cultural perspectives. As Christian doctrine emphasizes truth in G-d, this was a contentious topic that apologetics saw as contrary to their faith. Biblical Authority positions the Bible as the inerrant word of G-d.

The N-gram reflects that fundamentalism piqued interest around the Scopes trial, a case that debated if evolution could be taught in schools. Christology is collinear with Karl Barth and picks up after the publication of his Epistle to the Romans. Moral relativism remains with steady, low interest, but rises closer to the start of WW2. Theodicy hits a peak at the end of WW1, then loses interest, then rises again at the precipitation of WW2. Biblical Authority is not expressly popular, but can be inferred through the popularity of fundamentalism.