You wanted Scripture that shows that Christ is not Michael. Since Michael is an angel, and angels are creatures, this was the only possible way for me to respond.
The concept of chief angels (αρχάγγελοι) is present within Second Temple Judaism, the Epistle of Jude is the only place in the Bible that uses the term "archangel", but Jude is not being novel, but speaking from an established tradition of chief angels present already first within Second Temple Judaism and the early Christian movement.
An exact numeration of such angels is not found, but in addition to Michael we can include Gabriel, 2 Esdras 4:36 mentions the archangel Uriel (the text is also known as 4 Esdras and sometimes as 3 Esdras given the complexity of naming conventions, and is considered apocryphal by extent Christian groups, though was in the King James and other early English translations until the late 19th century). Here is the relevant text from the KJV,
"And unto these things Uriel the archangel gave them answer, and said, Even when the number of seeds is filled in you: for he hath weighed the world in the balance."
I don't expect you to consider this particularly convincing, but the fact remains that in both Jewish and Christian tradition (from which Jude is written) the concept of chief angels was never singular, the idea of multiple higher angels has been present for a long time. Insisting that there is only one archangel, Michael, is a modern idea that requires divorcing Scripture from its ancient historical context.
-CryptoLutheran