During the 20th century, televangelist Herbert W. Armstrong claimed to be God’s one true apostle on the earth, the one and only End Time Elijah who would restore all things before Christ's return. The following links provide evidence of the doctrinal errors and spiritual dangers of Armstrongism.
The Armstrong God Family Doctrine (PDF)
The Armstrong Born Again Doctrine (PDF)
The Trinity: A Case Study in Implicit Truth (LINK)
Ye are Gods? Human Deification Refuted (LINK)
The Personality of the Holy Spirit (PDF)
Anglo-Israelism Refuted (PDF)
TEACHING THE WORD OF GOD
During the 19th century, Ellen G. White claimed to be God’s true prophet; subsequent events have shown that she was, in reality, a false prophet, false teacher, plagiarist and liar. During her lifetime, she gained a fanatical following and unchallenged influence among an all-male clergy leading the early SDA movement. Her ability to receive a "vision" whenever needed conveniently kept her in charge. However, since her death in 1915, various researchers have documented the many failed predictions and gross doctrinal distortions of this spiritual Jezebel as noted in the links below.
Over the last 2000 years, there has been a steady stream of false apostles, false prophets and heretical teachers within Christianity, and Sabbath keeping groups have suffered just as much, if not more, from these problems. Jesus warned His followers that false prophets would come as wolves dressed in sheep's clothing (Matt 7:15); they talk like Christians but deny basic teachings of the faith (2Cor 11:13-15, Gal 1:6-7). Paul predicted that these wolves would arise from within the church and warned the elders to guard against them (Acts 20:28-31). The church has a duty to educate believers so they are not swayed by false teaching (Eph 4:11-16). Christians should expose the unfruitful works of darkness (Eph 5:11). There were times when Jesus and Paul publicly denounced false teachers (Matt 23, 1Tim 1:19-20, 2Tim 2:14-15). Let the reader beware.