Both the Jehovah’s Witnesses and the Seventh-day Adventist who theorize about the 2520 time prophecy have made accepting their views on Leviticus 26 a salvational / or testing message. Orthodox / Mainstream / Evangelical Christianity believes this is a clear identifying mark of cultism.
What is the interesting thing about cults, is that their peculiar belief always becomes “a testing message” in other words a salvational issue. They alone teach it and believe in it, and in turn elevate it to being just as essential as Jesus in regards to their salvation. All others are judged by it, and condemned for not believing in it.