Revelation Chapter 12 takes a look back at how Jesus Christ was born of the Jewish people and Satan's attempt to kill Him. And then it projects forward to that present moment in prophetic history, the beginning of the Great Tribulation, which is the latter 3 1/2 years of the Tribulation, when Satan is at war with Michael the archangel. After losing that war, Satan is cast down to the earth, forever losing access into heaven. And so, enraged, he empowers the Anti-Christ to kill the remaining Jews.