That's not what the theological doctrine of annihilation, as taught by the SDAs, JWs, Christadelphians, and others, means. For them, annihilation of unbelievers means they won't experience an eternity of suffering in Hades or Gehenna. Instead, their conscious life will be zapped after death. As stated by some in this thread, they move towards annihilationism because they find it obnoxious that God would send people to an eternity of conscious suffering.
This is one of the SDA statements of belief:
The punishment of the unrepentant is called the second death: After the final judgment the unrepentant receive their punishment. This punishment is called the second death. “Then death and Hades were thrown into the lake of fire. The lake of fire is the second death. Anyone whose name was not found written in the book of life was thrown into the lake of fire” (Rev. 20:14, 15; see also 21:8). The Bible also uses words such as “perishing” and “destruction” in speaking of the ultimate fate of the unrepentant (e.g.,
2 Peter 3:7, 9; John 3:16; Heb. 10:28; Mal. 4:1). These descriptions confirm that the second death refers to annihilation (or extinction) of the unrepentant, rather than a continual and eternal conscious torment (
Waking up to Eternity).
What about unbelievers now? The Scriptures seem to teach that they go into torment in the intermediate state in Hades at death, awaiting the final judgment. Peter described it this way:
“Then the Lord knows how to rescue godly men from trials and to hold the unrighteous for the day of judgment, while continuing their punishment” (2 Peter 2:9 NIV)
“To hold” in the Greek of this verse is a present, active infinitive, meaning that the wicked are being kept where they are, captive continuously. This verse clearly refutes annihilation of the wicked after death as there would be nothing “to hold” until the judgment day if they had no existence. Peter says the unrighteous are “continuing their punishment”, this phrase is interpreting a present, passive participle that indicates the unbelievers are being continuously tormented/punished. The Greek grammar of this text clearly states that the wicked dead are experiencing torment as they await the final judgment.
Oz