Richardson, Richardson and Bentley note that another evidence for the authenticity of the Book of Mormon is the fact that the equivalent of the biblical Satan is found therein (1 Nephi 12:17-19; 22:15; 2 Nephi 2:17-19) as well as in Mesoamerican belief.
Dee F. Green says the following:
Among the pantheon of gods credited to the Toltecs is found one called Tezcatlipoca. He was the god of war, pestilence, darkness, and the underworld. Numerous references by early native and Spanish authors such as Ixtlilxochitl, Sahagun, and Torquemada describe him as ferocious, wicked, and the author of wars and destruction among the people. One of his titles was "Sower of Discord."
Originally, he was the twin brother of Quetzalcoatl, but opposes him in all things. They are eternal enemies, and several interesting legends are told about the history of their feud.
An early account says that ". . . one day Quetzalcoatl hit him on the head with a club and Tezcatlipoca was knocked down from his throne up in the sky. As he fell down to the earth, he was transformed into a vicious jaguar that haunted the world, devouring people, nearly wiping out an entire generation. . ." Later, Quetzalcoatl was defeated and killed in battle by Tezcatlipoca. Quetzalcoatl, however, regained his life and then taught the Toltecs their religion, art, and culture.
Sometime thereafter, a great religious war occurred in which Tezcatlipoca defeated the Toltec followers of the god Quetzalcoatl. It is said that Tezcatlipoca used magic and tricks to defeat and kill them and that he will reign on the earth until the return of Quetzalcoatl.
The resemblances of both these gods to Christian concepts of Christ and Satan are curious indeed.
[Allen H. Richardson, David E. Richardson and Anthony E. Bentley, 1000 Evidences for the Church of Jesus Christ of Latter-day Saints: Part Two-A Voice from the Dust: 500 Evidences in Support of the Book of Mormon, p. 82]