[Kansas58]

http://en.wikipedia.org/wiki/Millerism

They are a cult.

[jacknhoo]

By virtue of their valid baptism, and their belief in Christ’s divinity and in the doctrine of the Trinity, Seventh-Day Adventists are both ontologically and theologically Christians. But Christians, once separated from the Church our Lord founded, are susceptible to being “tossed to and fro and carried about with every wind of doctrine” (Eph. 4:14).

http://www.catholic.com/library/Seventh_Day_Adventism.asp

[MikeSteelBe]

I’ve known a few extremist members of the Church of Christ that thought other Christian churches were apostste, but that doen not mean the entire COC is a cult. The extremist were members of small rural COCs. The larger ones I know of are good Bible churches.

[RBIEL2]

touche with Wikipedia
http://en.wikipedia.org/wiki/Seventh-day_Adventist_Church

Doctrines

Several distinctive Adventist doctrines have been claimed as heterodox by evangelical critics such as Anthony Hoekema. Teachings which have come under scrutiny are the annihilationist view of hell, the investigative judgment (and a related view of the atonement), and the Sabbath; in addition, it has been alleged that Adventist doctrine suffers from legalism.[75]

While critics such as Hoekema have classified Adventism as a sectarian group on the basis of its atypical doctrines,[15][16] it has been considered more mainstream by Protestant evangelicals since its meetings and discussion with evangelicals in the 1950s.[76] Notably, Billy Graham invited Adventists to be part of his crusades after Eternity, a conservative Christian magazine edited by Donald Barnhouse, asserted in 1956 that Adventists are Christians. Walter Martin, who is considered by many to be the father of the counter-cult apologetics movement within evangelicalism, authored The Truth About Seventh-day Adventists (1960) which marked a turning point in the way Adventism was viewed.[77][78]

"...it is perfectly possible to be a Seventh-day Adventist and be a true follower of Jesus Christ despite heterodox concepts..."

– Walter Martin, Kingdom of the Cults[79]

Later on Martin planned to write a new book on Seventh-day Adventism, with the assistance of Kenneth R. Samples.[80] Samples subsequently authored "From Controversy to Crisis: An Updated Assessment of Seventh-day Adventism", which upholds Martin's view "for that segment of Adventism which holds to the position stated in QOD, and further expressed in the Evangelical Adventist movement of the last few decades." However, Samples also claimed that "Traditional Adventism" appeared "to be moving further away from a number of positions taken in QOD," and at least at Glacier View seemed to have "gained the support of many administrators and leaders".[81]