That is total bulldookey. SDAs never teach salvation by works, but by grace through faith. We teach works are the unavoidable consequence of having been saved by grace through faith, while cultists like you teach disobedience to the Ten Commandments, which is not sanctioned anywhere in Scripture.
If you didn't have such a warped understanding of church history, you'd know this teaching used to be considered mainstream and easily proven from Scripture. That when the Son of God manifested Himself as "the angel of the Lord" He took the name Michael meaning "who is like God", just as when He manifested Himself as a man and took the name "Jesus". "Archangel" means "ruler of angels", which is what Christ also was. It was only when the JWs began twisting this to "prove" Christ was only a created being that many got away from this teaching, but consensus is a poor substitute for exegesis when determining what is truth.
To what "spirits" do you refer? I've already shown you that the "spirit" in man is God's Spirit which at the moment of death is withdrawn from the saint, sinner, or any other creature in the animal kingdom just as it was at the moment when God breathed the Spirit of life into the creature the moment it came to life. It is you who choose to believe the lie of Satan in the garden "thou shalt not surely die" because you argue that at death, we keep on living, remembering, thinking, caring, etc., which things the wisest man in the world said absolutely do not happen. Who's the cult member?
We believe she was a modern day prophet who never contradicted one word of Scripture and declared "the Bible and the Bible alone is our creed, the sole bond of union" while Blavatsky, Southcott, Russell, Smith, Casey, Peale, etc. were trying to convince everyone to look to their writings as superior inspiration to Scripture. It is you cultists who deny the gift of the Spirit of Prophecy would be in the last day church when Revelation 12:17 absolutely declares that it would be so.