You believe WHAT?

The Seventh-day Adventist Church arose from the Millerite movement of the 1840s. The Millerite movement was part of the Second Great Awakening and originated with William Miller, a Baptist preacher from Low Hampton, New York. Miller predicted on the basis of Daniel 8:14 and the "day-year principle" that Jesus Christ would return to Earth on October 22, 1844. When this failed to occur, most of his followers disbanded and returned to their original churches.

Following this "Great Disappointment" (as it came to be known), a small number of Millerites came to believe that Miller's calculations were correct, but that his interpretation of Daniel 8:14 was flawed.

Beginning with a vision reported by Hiram Edson on October 23, these Adventists arrived at the conviction that Daniel 8:14 foretold Christ's entrance into the "Most Holy Place" of the heavenly sanctuary rather than his second coming.

Over the next decade this understanding developed into the doctrine of the investigative judgment: an eschatological process commencing in 1844 in which Christians will be judged to verify their eligibility for salvation.

The Adventists continued to believe that Christ's second coming would be imminent, although they refrained from setting further dates for the event.

Adventists uphold teachings such as the infallibility of Scripture, the substitutionary atonement, the resurrection of the dead and justification by faith alone, and are therefore often considered evangelical. [9] In common with certain other Christian churches, they believe in baptism by immersion and creation in six literal days.

In addition, there is a generally recognized set of "distinctive" doctrines which distinguish Adventism from the rest of the Christian world, although not all of these teachings are wholly unique to Adventism:

Law (fundamental belief 19) - the Law of God is "embodied in the Ten Commandments", which continue to be binding upon Christians.

Sabbath (fundamental belief 20) - the Sabbath should be observed on the seventh day of the week, i.e., from Friday sunset to Saturday sunset.

Second Coming and End times (fundamental beliefs 25-28) - Jesus Christ will return visibly to earth after a "time of trouble", during which the Sabbath will become a worldwide test. The second coming will be followed by a millennial reign of the saints in heaven. Adventist eschatology is based on the historicist method of prophetic interpretation.

Holistic human nature (fundamental beliefs 7, 26) - Humans are an indivisible unity of body, mind and spirit. They do not possess an immortal soul, and death is an unconscious sleep (commonly known as "soul sleep"). (See also: Christian anthropology)

Conditional immortality (fundamental belief 27) - The wicked will not suffer eternal torment in hell, but instead will be permanently destroyed. (See: Conditional immortality, Annihilationism)

Great Controversy (fundamental belief 8) - Humanity is involved in a "great controversy" between Jesus Christ and Satan. This is an elaboration on the common Christian theory that evil began in heaven when an angelic being (Lucifer) rebelled against the Law of God.

Heavenly sanctuary (fundamental belief 24) - At his ascension, Jesus Christ commenced an atoning ministry in the heavenly sanctuary. In 1844, He began to cleanse the heavenly sanctuary in fulfillment of the Day of Atonement.

Investigative Judgment (fundamental belief 24) - A judgment of professed Christians began in 1844, in which the books of record are examined for all the universe to see.
The investigative judgment will affirm who is worthy of salvation, and vindicate God as just in His dealings with mankind.