To get a reasonable estimate on the question, "How perfectly does Satan control Seventh-day Adventists?" let's first consider what the Spirit of prophecy states about the religious leaders and rabble of Christ's day:
O, that the Jewish people had recognized Christ as the true light which lighteth every man that cometh into the world! But Satan had determined that if he could not overthrow the Prince of Life, he would so blind the eyes of the nation that they would reject the Saviour. God had worked in majesty and power to make of Israel a chosen nation, a royal priesthood, that they might show forth the light of His truth. They had been exalted to heaven by their privileges. This people Satan determined to use as his agents in quenching all heaven-sent light. ST, August 15, 1900 par. 5.
He succeeded in gaining the Jewish teachers to his side. While the light in the temple court was causing joy and gladness among the worshipers the hearts of the Pharisees were filled with bitterness and murder. They were under the control of Satan. ST, August 15, 1900 par. 6.
With a great show of prudence the rabbis had warned the people against receiving the new doctrines taught by this new teacher; for His theories and practices were contrary to the teachings of the fathers. The people gave credence to what the priests and Pharisees taught, in place of seeking to understand the word of God for themselves. They honored the priests and rulers instead of honoring God, and rejected the truth that they might keep their own traditions. Many had been impressed and almost persuaded; but they did not act upon their convictions, and were not reckoned on the side of Christ. Satan presented his temptations, until the light appeared as darkness. Thus many rejected the truth that would have proved the saving of the soul. DA 489.4.
Satan was constantly afflicting the Son of God and creating prejudice in the minds of people. Not only were Christ’s doctrines and teachings perverted, misinterpreted, and wrested from their true meaning, but falsehoods followed Him everywhere. The misrepresentations that the chief priests, Pharisees, and Sadducees poured into the ears of the people appealed to the worst passions of adulterers, fornicators, and the dishonest, exciting a burning prejudice that made it almost impossible for Him to live upon the earth for even three and a half years after His public ministry began. CTr 29.3.
Why, then, Christ has said, should those who bear the truth of God to the world be discouraged and fainthearted? “If the world hate you, ye know that it hated me before it hated you.” Ye “are not of the world, even as I am not of the world.” They will “revile you, and persecute you, and . . . say all manner of evil against you falsely, for my sake.” “Yea, the time cometh, that whosoever killeth you will think that he doeth God service. And these things will they do unto you, because they have not known the Father, nor me.” CTr 29.4.
Satan’s malignity reached its height when the Lord of Glory was crucified, and we may expect in our day that human hearts will be open to prejudice and to the falsehoods, wicked misrepresentations, and slander of those who love this kind of satanic work. It is a wisdom from beneath. It is hell-born, and its results will be as in Christ’s day.—Manuscript 55, 1886. CTr 29.5.
"I know you," Christ declared to the Pharisees, "that ye have not the love of God in you." He spoke to them thus plainly because they could not discern His divinity under the veil of humanity. He was God in human flesh, and He could not but work the works of God. Unbelief, prejudice, and jealousy beat about Him, and if His humanity had not been united with divinity, He would have failed and become discouraged. At times His divinity flashed through humanity, and He stood forth as the Son of God, His veil of flesh too transparent to hide His majesty. But the men who claimed to be the expositors of the prophecies refused to believe that He was the Christ. Satan had control of their minds, and they utterly refused to acknowledge the divinity of Jesus of Nazareth. RH, March 26, 1901 par. 12.
The teachers of the people in the time of Christ were fully satisfied with themselves. They held counsels and strengthened one another in their ideas and opinions, and Satan was in their assemblies controlling their decisions. They strove to make the people afraid of hearing the words of Christ. They threatened to turn those who would heed his doctrine out of the synagogue, and this was regarded by the people as the greatest curse that could fall upon them. ST, May 26, 1890 par. 9.
Christ ever rebuked the Pharisees for their self-righteousness. They extolled themselves. They came forth from their religious services, not humbled with a sense of their own weakness, not feeling gratitude for the great privileges that God had given them. They were exalted to heaven in point of opportunity, in having the Scriptures, in knowing the true God, but their hearts were not filled with thankfulness to God for his great goodness toward them. They came forth filled with spiritual pride, and their theme was self--"myself, my feelings, my knowledge, my ways." Their own attainments became the standard by which they measured others. Putting on the robes of self-dignity, they mounted the judgment seat to criticise and to condemn. But no human being has been authorized of God to do this work. It is the very essence of Phariseeism. It is gathering about the soul the very shadows of darkness so that the light of life cannot penetrate the darkness. Satan deluded the Jews with a natural or legal religion, which was full of selfishness and hypocrisy, and thus were light and knowledge perverted; but this exalting of self, this self-righteousness, is nothing short of deception and self-destruction. Jesus said to Nicodemus, "Ye must be born again." ST, December 17, 1894 par. 1.
During Christ's life on earth the scribes and Pharisees, instigated by Satan, tempted him in every possible way. But he never allowed these temptations to lead him from the path of obedience. When God speaks, let us obey, no matter how the enemy may tempt us to disobey; for the path of obedience is the only safe path. ST, May 27, 1897 par. 13.
Christ's words were spoken with a quiet dignity and with an assurance and power that sent conviction to the hearts of the scribes and Pharisees. They felt the power of the message sent from heaven. God was knocking at the door of their hearts, entreating entrance. But they refused to listen. By their persistent rejection of warnings and invitations they caused Him to abandon them to their blindness and its results. Satan was working with all his power to secure them in his cause, and under his control they developed a stubbornness which brought upon them their ruin. ST, August 29, 1900 par. 16.
As Christ redoubled his efforts, manifesting his love in works of mercy, in pouring a flood of light upon a sin-stricken world, because the Pharisees could not controvert his doctrine, they threatened, hunted, and persecuted the Son of God. The people rejoiced in the wonderful works that Christ was doing; but the Pharisees, under the training and discipline of Satan, were so blinded that they charged Christ with casting out devils through the prince of devils. What a terrible pass for men to come to who profess to be the children of God! Those who begin to criticise and judge others know not to what lengths they will be led. ST, December 17, 1894 par. 3.
Then they questioned again, "What did He to thee? how opened He thine eyes?" With many words they tried to confuse him, so that he might think himself deluded. Satan and his evil angels were on the side of the Pharisees, and united their energies and subtlety with man's reasoning in order to counteract the influence of Christ. They blunted the convictions that were deepening in many minds. Angels of God were also on the ground to strengthen the man who had had his sight restored. DA 473.4.
Satan with his angels, in human form, was present at the cross. The archfiend and his hosts were co-operating with the priests and rulers. The teachers of the people had stimulated the ignorant mob to pronounce judgment against One upon whom many of them had never looked, until urged to bear testimony against Him. Priests, rulers, Pharisees, and the hardened rabble were confederated together in a satanic frenzy. Religious rulers united with Satan and his angels. They were doing his bidding. DA 746.4.
The message of salvation is communicated to men through human agencies. But the Jews had sought to make a monopoly of the truth which is eternal life. They had hoarded the living manna, and it had turned to corruption. The religion which they tried to shut up to themselves became an offense. They robbed God of His glory, and defrauded the world by a counterfeit of the gospel. They had refused to surrender themselves to God for the salvation of the world, and they became agents of Satan for its destruction. DA
The people whom God had called to be the pillar and ground of the truth had become representatives of Satan. DA
36.2.Consider the Parallels
According to Ellen G. White, Seventh-day Adventists resemble the Jews of the first century in terms of mindset and experience.http://www.everythingimportant.org/seventhdayAdventists/sensibility.htmThis is the Seventh-day Adventist Experiencehttp://www.everythingimportant.org/seventhdayAdventists/character.htm
Thus the Spirit of prophecy has been fulfilled:
"In His Word the Lord declared what He would do for Israel if they would obey His voice. But the leaders of the people yielded to the temptations of Satan, and God could not give them the blessings He designed them to have, because they did not obey His voice but listened to the voice and policy of Lucifer. This experience will be repeated in the last years of the history of the people of God, who have been established by His grace and power. Men whom He has greatly honored will in the closing scenes of this earth's history pattern after ancient Israel." Manuscript Releases
, vol. 13, 379.