Where did the church come from?
Seventh-day Adventists emerged from nineteenth-century American revival movements. William Miller's followers expected Jesus to return in 1844. When that expectation failed, an event remembered as the Great Disappointment, different groups reconsidered their interpretations. Some developed the beliefs that shaped the Seventh-day Adventist Church, formally organized in 1863. Joseph Bates and James and Ellen White were important early leaders. The church's historical introduction explains this development. The failed prediction remains part of this history. The church does not now teach that a new date should be set for Jesus' return.
What is distinctive about their beliefs?
“Seventh-day” refers to the Sabbath, observed from Friday sunset to Saturday sunset as a time of rest, worship, and service. “Adventist” refers to Christ's coming, especially his anticipated return. Adventists teach salvation through Jesus and affirm the Trinity. They also understand death as unconscious rest until resurrection. Their teaching about an investigative judgment concerns Christ's heavenly ministry before his return: a judgment revealing who belongs to Christ and is ready for life in his kingdom. These are Adventist interpretations, not conclusions accepted by all Christians.
What might church life look like?
A Saturday gathering commonly includes Bible study, singing, prayer, and a sermon. Baptism by immersion follows a profession of faith. Communion includes a foot-washing service expressing humility and mutual care. Congregations belong to regional bodies connected with the worldwide General Conference. Schools, hospitals, health education, and community service are prominent in the church's work. Worship language and musical style vary across cultures; a worldwide church is not a single local experience.
Where do Christians disagree?
Adventists regard Ellen White's ministry as a manifestation of the gift of prophecy while affirming the Bible as the standard for testing teaching. Other Christians do not grant her writings that authority. Christians also differ over Sabbath observance and the interpretation of Daniel and Revelation. Many worship on Sunday and understand the Sabbath's continuing significance differently. Read the church's fundamental beliefs for its own account, and compare the arguments about law and Sabbath, prophecy and spiritual gifts, and Revelation. These differences can be explained without dismissing Adventists' faith or presenting their conclusions as universal Christian teaching.
Sources & further reading
A question in the margin is a good place to begin.