You're only looking at part of Daniel's prophesy. When, according to Scripture did Michael stand up for the children of thy people?
Rev 12 when describing what begins to be fulfilled with the birth of the man child (Christ), on the earth. According to the Scripture the birth of Christ is when Michael and His angels fought against the dragon and hi angels, and the dragon with his angels are cast out of heaven to the earth. Then a loud voice from heaven says, "Now is come salvation, and strength, and the Kingdom of our God, and the power of His Christ". This is when Michael stood up for the children of thy (believers) people.
Revelation 12:7-10 (KJV) And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, And prevailed not; neither was their place found any more in heaven. And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him. And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night.
It is after the war in heaven that happened when Christ was born, and Satan and his angels cast to earth that we read of the wrath of Satan as he and his followers go about persecuting the woman (Old Covenant faithful Israel) and making war against her Seed (Christians). This is the beginning of GREAT TRIBULATION that Christ warns His disciples would come upon the Church on earth as She goes unto all the nations proclaiming the Gospel through the power of the Holy Spirit.
Revelation 12:13-17 (KJV) And when the dragon saw that he was cast unto the earth, he persecuted the woman which brought forth the man child. And to the woman were given two wings of a great eagle, that she might fly into the wilderness, into her place, where she is nourished for a time, and times, and half a time, from the face of the serpent. And the serpent cast out of his mouth water as a flood after the woman, that he might cause her to be carried away of the flood. And the earth helped the woman, and the earth opened her mouth, and swallowed up the flood which the dragon cast out of his mouth. And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
What entity on earth has ever suffered greater martyrdom and persecution on this earth and still survives and continues to expand as the universal Church on earth? There has never been any greater tribulation, nor will there ever be then "great tribulation" the Church on earth must endure and survive so the Kingdom of heaven will be complete.
Christ says believers will understand/see how Satan and his evil army will wage war upon the Church on earth as She faithfully obeys Her task of taking the Gospel unto all the earth. Because this battle being waged is spiritual good against evil. And this evil will always be present with the Church on earth because Satan is the god of this world, whom believers must fight against as this great evil infiltrates Christian communities, and through deception, and guile will be able to bring to ruin places of worship.
From the birth of Christ, when Michael stood up for believers, this period of "great tribulation" against the Church on earth began when Satan was cast out of heaven and the greatest spiritual battle ever to come and will never come again began. Great tribulation" began then and will not end until Satan's "little season" ends with him being cast into the eternal flames of the Lake of Fire.
Until you understand what and when "great tribulation" is none of what you assume can be accurate. If wrong in this, you're wrong in all.