Biblical basis that Michael is another name for Jesus are numerous. The belief that one of Jesus' many names is Michael by itself does not mean the rejection of Jesus' divinity or the Trinity.
1.Michael is referred to as "the great prince" (Dan 12:1), Gabriel told Daniel "except Michael your prince" (Dan 10:21). Angels are rarely referred to as princes, certainly not as our prince. However, Isaiah 9:6 states of Jesus, "His name will be called Wonderful, Counselor, Mighty God, Everlasting Father, Prince of Peace"
2.Archangel means the chief of angels. The word Archangel is mentioned twice in the Bible (Jude 9, 1 Thess 4:16), one time applied directly to Michael, both times appearing in singular form. Gabriel actually is never specified as an Archangel in the Bible, only according to tradition. Further, Michael is never actually described in the Bible as an angel, only as Archangel and prince. No evidence in the Bible to show that Gabriel is his equal.
3.Jesus is called the Angel of the Lord in many instances of the Bible. Angel can also mean messenger. Neither names imply that Jesus is a literal angel or creation.
4.Joshua meets an unnamed Man who calls Himself the "Commander of the army of the Lord" in Joshua 5:14. Jesus is this commander and the army of the Lord are His angels.
14 So He said, "No, as Commander of the army of the Lord I have now come." And Joshua fell on his face to the earth and worshiped, and said to Him, "What does my Lord say to His servant?" 15 The Commander of the Lord's army said to Joshua, "Take your sandal off your foot, for the place where you stand is holy."
5.The original controversy in heaven was between Jesus and Satan. Satan wanted to be like the Most High. In such a pivotal battle, "Michael and his angels fought with the dragon; and the dragon and his angels fought" (Rev 12:7). If this was not Jesus Himself, where was He? Is He not the commander of the Lord's army? Was He not at Joshua's battles?
6.Some Christians question why Michael would say in Jude 9 "The Lord rebuke you!" if he is God. But in Zechariah 3:2, God says the same words "The Lord rebuke you, Satan!"
7.Finally who will deliver us in the end? Is it not Jesus Himself?
(Dan 12:1) At that time Michael shall stand up, the great prince who stands watch over the sons of your people; and there shall be a time of trouble, such as never was since there was a nation, Even to that time. And at that time your people shall be delivered.
Compare this with:
(Rev 19:11-14) Now I saw the heaven open, and behold, a white horse. And He who sat on Him was called Faithful and True, and in righteousness He judges and makes war... And the armies in heaven, clothed in fine linen, white and clean followed Him on white horses.
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