The answer
The Adventists are a dangerous heretical sect which shares with the Jehovah's Witnesses many serious errors. Among the most well-known of their heretical beliefs are:
1. They believe that Christ is the angel Michael.
2. They believe that Christ was born in original sin.
3. They call the Holy Spirit, 'the vice-regent of the Lord's host'.
4. They believe that Saturday is the Lord's day, instead of Sunday.
5. They don't believe in the immortality of the soul.
6. They believe that Jesus will come three times in all. 7. They believe in an earthly kingdom and that heaven will not be for mankind.
8. They believe in the extinction of the wicked and not their torture.
9. They don't believe in the priesthood or intercession, or most of the other sacraments of the Church.
10. They have many other wrong beliefs which I will point out later, if God wills.
In addition to this, they have a Protestant origin, which means they deny the passing on of tradition, and the reverence of the saints, and do not use candles, incense or an altar, and do not share our Church's rituals, and refuse the Church canons, councils, the Fathers and the priesthood.
I am hoping that by God's grace I will be able to bring out a book about them for you, in which I can repudiate their beliefs, and especially what their leader, Alan White, has said in their books.
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Thrice-Blessed Pope Shenouda III of Blessed Memory