Belief in a literal Satan also plays an important role in Christian eschatology, the study of end-of-days prophecies. Those who believe that the end times are upon us have been especially popular.
Perpetual doomsayer Hal Lindsey wrote a best-selling and influential 1972 book titled "Satan Is Alive And Well on Planet Earth" in which he discussed - and cited evidence of - a literal Satan walking among us. A quarter-century later Tim LaHaye and Jerry Jenkins hit on similar themes in their "Left Behind" books that sold over 65 million copies and remain one of the best-selling fiction series in print.
Many Christians also believe that occult divination tools such as Tarot cards, pendulums, and Ouija boards can connect with, and even summon, evil spirits including Satan. Some even promote conspiracy theories involving Satan, claiming for example that credit cards and bar codes are not only "marks of the Beast" (i.e., Satan), but signs of an impending and demonic New World Order.
This is part of a broader trend of biblical literalism. Many believe that Earth was created by God in only seven days, in the case of so-called "intelligent design" creationism, less than 10,000 years ago. Another common belief is that Noah's Ark really existed (and that it's periodically re-discovered on a Turkish mountain), and so on.