If Jesus isn't Michael the archangel, could someone (or maybe more than one person) explain why?
Because Jesus is God who was not created, and Michael is an angel that was created.
The Bible says that Jesus was made better than the angels, which is the man Christ Jesus, and now a glorified body whose deity is God, for Jesus is God manifest in the flesh, and in Him dwells all the fulness of the Godhead bodily.
Jesus is not in angelic form, but in a glorified body, which the throne in heaven is the throne of God and the Lamb, God in the glorified body of the man Christ Jesus.
The angels worship Jesus, and He is above all principality, power, and authority.
Which the Bible says that Jesus dwells in the light that no person can approach unto, and no person has ever seen Jesus, and no person will ever see Jesus, for He is the invisible God that showed a visible image of Himself.
Jesus sits on the right hand of God, which the Bible says none of the angels will have that privilege.
The Bible says God is our Savior, and the man Christ Jesus the mediator between God and men, for only a sinless man can reconcile mankind to God, and no angel is qualified to provide salvation for people.
The angels are ministering spirits to the saints, and the angels desire to look in to the salvation of the saints for the saints will have a higher position in heaven than that of the angels.
Angels are greater than the saints when they are in the flesh, but the saints are greater in a glorified body than the angels.
Concerning Jesus the Bible says thy throne O God is eternal and forever.
Jesus is made after the order of Melchizedek who is without decent, having neither father or mother, and having no beginning of days, or end of life, which he was a visible image of God.
Jesus as God was not created which He is from everlasting which means no beginning, and God said there was no God formed before Him, and there shall be no God formed after Him.
Michael is only an angel, and if the saints are greater than the angels then Jesus would be greater than an angel.
Also the Bible says do not worship an angel, and the saints worship Jesus.