Geisler is known first and foremost as a classical Christian apologist. Between 1970 and 1990 he participated in dozens of public debates and gained a reputation as a defender of theism, biblical miracles, the resurrection of Jesus, and the reliability of the Bible. The first attempt to publish an outline of his apologetic method showed up in an appendix of his 1990 book "When Skeptics Ask". The appendix is titled "Reasoning to Christianity from Ground Zero" and in it we see a high-level view of the holistic system of classical apologetics he had been developing over the years. The first outline contained fourteen points of argument: