A central teaching of Jehovah's Witnesses is that the current world era, or "system of things", entered the "last days" in 1914 and faces imminent destruction through intervention by God and Jesus Christ, leading to deliverance for those who worship God acceptably. They consider all other present-day religions to be false, identifying them with "Babylon the Great", or the "harlot", of Revelation 17, and believe that they will soon be destroyed by the United Nations, which they believe is represented in scripture by the scarlet-colored wild beast of Revelation chapter 17. This development will mark the beginning of the "great tribulation". Satan will subsequently attack Jehovah's Witnesses, an action that will prompt God to begin the war of Armageddon, during which all forms of government and all people not counted as Christ's "sheep", or true followers, will be destroyed. After Armageddon, God will extend his heavenly kingdom to include earth, which will be transformed into a paradise similar to the Garden of Eden. After Armageddon, most of those who had died before God's intervention will gradually be resurrected during "judgment day" lasting for one thousand years. This judgment will be based on their actions after resurrection rather than past deeds. At the end of the thousand years, Christ will hand all authority back to God. Then a final test will take place when Satan is released to mislead perfect mankind. Those who fail will be destroyed, along with Satan and his demons. The end result will be a fully tested, glorified human race.
Who needs to attack Jehovah Witnesses for God to begin the war of Armageddon?
Satan