Killer FedEx driver Tanner Horner claimed he had made a “deal with the devil” by slaying 7-year-old Athena Strand, the jury at his murder trial was told. The confessed child murderer compared his crimes to the 2017 movie “American Satan,” in which a rock band commits human sacrifices as part of a pact with a demonic entity to achieve fame and success, forensic psychiatrist Dr. Eileen Ryan told the jury in a Fort Worth, Texas, courtroom on Wednesday. “He [Horner] spoke quite specifically about the movie ‘American Satan.’ He described a belief that he had entered into a ‘deal with the devil’ — not necessarily in a supernatural sense, but as a catastrophic moral trade,” Ryan said. “In his mind, he believed that by taking Athena’s life, he was ‘saving’ his own life and career,” she added. Killer FedEx driver Tanner Horner claimed he had made a “deal with the devil” by slaying 7-year-old Athena Strand.…