Seven day Adventist developed out of the Millerite movement organized by William Miller in the 1840's. William Miller was a former Baptist preacher who formed his own religious views, stating that all churches had become apostate and were "Babylon," that all Christians were to leave those churches and join his movement, and that the second coming, or the advent, of Jesus Christ was imminent. He (William Miller) developed a teaching in which he claimed that he knew the exact year and day in which Jesus Christ would return. Ellen G. Harmon (later Ellen G. White) became a member and follower of the Millerite movement....^[1]

Miller was an active Freemason: "It was here [Poultney, Vermont] that Mr. Miller became a member of the Masonic fraternity, in which his perseverance, if nothing else, was manifested; for he advanced to the highest degree which the lodges then held to in the country, or in that region, could confer."^[2]

..."Most followers of the original Millerite movement disbanded, but small groups continued which were not directly connected with or under the authority of William Miller. One of those groups included Ellen G. Harmon (White).

Ellen G. Harmon (White) continued with the group with which she was affiliated and later met James White. They married in 1846 and with the union and the continuing visions of Ellen G. White, they were established as the leaders of what had become a revised Adventist movement and foundation of current Seventh-day Adventist theology. Seventh-day Adventist theology has very deep roots in the Millerite movement, but has progressed far beyond those basic teachings as a result of the visions claimed by Ellen G. White." ^[1]

Today the the Seventh Day Adventist is composed of two divisions (1) Seventh Day Adventist and (2) Seventh Day Adventist Reformed .The 'Seventh Day Adventist Reformed' was formed in July 1925 as a result of an internal dispute as to whether one should serve in World War 1^[3] or any war.

Ellen G Harmon (White)  

One cannot properly examine the seventh day Adventist organization without gaining an understanding of one of it's most controversial founders, Ellen G Harmon (White). Ellen G Harmon was born Nov. 26, 1827, Gorham, Maine, U.S. died July 16, 1915, St. Helena, California under the married name of Ellen G White.

Ellen Harmon sustained a serious injury when she was nine years old, an angry schoolmate threw a stone, which struck her on the nose and caused significant injury. Some have alleged that this blow so severely damaged the temporal lobe of her brain as to cause her to have a type of epilepsy known as partial complex seizures (also called complex partial seizures). Thus, it is argued, that her visions were not divine revelations from God, but due to temporal lobe epilepsy.[4]. More can be read about how this injury affected her from a medical point of view written by Donald I. Peterson, MD at (1) http://www.whiteestate.org/issues/visions.html#injury and (2) the article written by Doug Hackleman, Editor, Adventist Currents, June 1985 at   http://www.ellenwhiteexposed.com/headinjury.htm. 

Her education ended with a brief period at the Westbrook Seminary and Female College of Portland, Maine, in 1839. The following year she underwent a religious experience at a Methodist camp meeting, and she was baptized in 1842. A short time later she followed her family in becoming a follower of William Miller, the Adventist prophet who was preaching the imminent return of Christ (fixed for October 22, 1844). Undismayed later by the apparent failure of Miller’s prophecy, Harmon retained the Adventist view.[5]

The Place of Ellen G White in 21st Century Seventh Day Adventist

Both the Seventh Day Adventist and the Reformed Adventist hold Ellen G. White in high regard and acknowledge her as having the Biblical gift of prophecy as stated in the following belief statement of both groups. Thought the claim is White's writing is the lesser light that leads to the greater light which is scripture,
 

The Prophecies  / Visions of Ellen G White

When one looks at the prophecies / revelations of Ellen White objectively, from a Biblical view, one has to keep in mind what is said in the following passages. A person obedient to the word of God will heed its warnings.

 

Ellen G White's Testimonies for the Church Reference	Revelation  / Visions	The Biblical Record
Testimonies for the Church Volume One : Page 58-59 9. My First Vision	"...Soon we heard the voice of God like many waters, which gave us the day and hour of Jesus' coming. The living saints, 144,000 in number, knew and understood the voice, while the wicked thought it was thunder and an earthquake. When God spake the time,.." The 144,000 were all sealed and perfectly united. On their foreheads were the words God, New Jerusalem, and a glorious star containing Jesus' new name. At our happy, holy state the wicked were enraged, and would rush violently up to lay hands on us to thrust us into prison, when we would stretch forth the hand in the name of the Lord, and they would fall helpless to the ground. Then it was that the synagogue of Satan knew that God had loved us, who could wash one another's feet, and salute the brethren with a holy kiss, and they worshiped at our feet.	Mark 13:32–37   32   “But of that day or hour no one knows, not even the angels in heaven, nor the Son, but the Father alone.   33   “Take heed, keep on the alert; for you do not know when the appointed time will come.   34   “It is like a man away on a journey, who upon leaving his house and putting his slaves in charge, assigning to each one his task, also commanded the doorkeeper to stay on the alert.   35   “Therefore, be on the alert—for you do not know when the master of the house is coming, whether in the evening, at midnight, or when the rooster crows, or in the morning—   36   in case he should come suddenly and find you asleep.   37   “What I say to you I say to all, ‘Be on the alert!’ ” The privileges of Ellen G White to have divine things revealed to her exceeds that of Jesus himself. For she has been privileged to know the day and hour. This blatantly contradicts scripture. "...and they worshiped at our feet. " The other point of note is that Mrs. White has humans receiving worship, no where in scripture is this permitted. Whether to men (Acts 10:25-26) or angels(Acts 22:8-9). To do so, is disobedience to God by violating the ten commandments (Ex 20:5)
Testimonies for the Church, vol. 4, pp. 147-148)   Scroll to page 42 of the PDF file.	In 1876 EGW Stated - "In ancient times God spoke to men by the mouth of prophets and apostles. In these days He speaks to them by the Testimonies of His Spirit."	Here EGW states that, "In ancient times God spoke to men by the  mouth of prophets and apostles. In these days He speaks to them by the Testimonies of His Spirit." By making this statement she has placed herself above the person of Christ as God's revelation to men. In addition she has placed herself on par with the prophets and apostles as men in which the revelation of God came.   By doing the before mentioned she places herself in direct contradiction to the scriptures which say:   Heb 1:1-2  1   God, after He spoke long ago to the fathers in the prophets in many portions and in many ways,  2   in these last days has spoken to us in His Son, whom He appointed heir of all things, through whom also He made the world.
(Testimonies for the Church, vol. 5, p. 66 -67. Testimony 31; 1882.)	In 1882 EGW stated -  "If you lessen the confidence of God's people in the testimonies He has sent them, you are rebelling against God as certainly as were Korah, Dathan, and Abiram."	Here EGW uses intimidation and guilt against those who take issue against those who are in disagreement with her testimonies for the church by accusing them as being in rebellion against God and equating them with rebellious person as mentioned in scripture (Korah, Dathan, and Abiram).
On page 485 -486 of 'Great Controversy (1927 ed.)	EGW stated, "In the typical service the high priest, having made the atonement for Israel, came forth and blessed the congregation. So Christ, at the close of His work as mediator, will appear, "without sin unto salvation" (Hebrews 9:28), to bless His waiting people with eternal life. As the priest, in removing the sins from the sanctuary, confessed them upon the head of the scapegoat, so Christ will place all these sins upon Satan, the originator and instigator of sin. The scapegoat, bearing the sins of Israel, was sent away "unto a land not inhabited" (Leviticus 16:22); so Satan, bearing the guilt of all the sins which he has caused God's people to commit, will be for a thousand years confined to the earth, which will then be desolate, without inhabitant, and he will at last suffer the full penalty of sin in the fires that shall destroy all the wicked. Thus the great plan of redemption will reach its accomplishment in the final eradication of sin and the deliverance of all who have been willing to renounce evil."	1 Peter 2:21–24  21 For you have been called for this purpose, since Christ also suffered for you, leaving you an example for you to follow in His steps, 22 who committed no sin, nor was any deceit found in His mouth; 23 and while being reviled, He did not revile in return; while suffering, He uttered no threats, but kept entrusting Himself to Him who judges righteously; 24 and He Himself bore our sins in His body on the cross, so that we might die to sin and live to righteousness; for by His wounds you were healed. If a SDA follower believes Ellen G. White teaching that our sins where placed on Satan. There is no hope for them for it was Christ who bore the sins of the world. (Is 53:11-12; John 1:29; Heb 9:28) The Old Testament is to be understood Christology especially in the matters of salvation. Satan is the enemy of man and not the savior or enabler of any work of salvation. It would be to Satan's advantage to save souls thus avoiding punishment all together if this teaching of Mrs. White was true. Again Ellen G White has taught a doctrine in the area of salvation that contradicts scripture and reflects the insufficiency of Christ work of salvation. This teaching reflects the slant of another gospel and the work of a different Jesus. She even misrepresents the work of Satan himself, as found in scripture..