Seventh-Day Adventist Beliefs: The Great Controversy
All humanity is now involved in a great controversy between Christ and Satan regarding the character of God, His law, and His sovereignty over the universe. This conflict originated in heaven when a created being, endowed with freedom of choice, in self-exaltation became Satan, God's adversary, and led into rebellion a portion of the angels. He introduced the spirit of rebellion into this world when he led Adam and Eve into sin. This human sin resulted in the distortion of the image of God in humanity, the disordering of the created world, and its eventual devastation at the time of the worldwide flood. Observed by the whole creation, this world became the arena of the universal conflict, out of which the God of love will ultimately be vindicated. To assist His people in this controversy, Christ sends the Holy Spirit and the loyal angels to guide, protect, and sustain them in the way of salvation.
--Fundamental Beliefs, 8
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I've seen this idea--this good versus
evil--called "dualist" before. While in the etymological sense it is true, there being two sides, in Christianity it's not actually dualism in the theological sense of two gods who have been opposite each other for eternity. Rather, this is a conflict between a one God (and his faithful creations) against his rebellious creations.
The Great Controversy is also a book by Ellen Gould White on the history of the Christian church from the destruction of Jerusalem to the Millerite movement and, looking forward, through the plan of salvation and to the end of the world. Sometimes packaged with a cheesy sci-fi cover and sold under the name "Cosmic Conflict". Those people who are not averse to reading books online can find it at: