Of Eru

[WarBringer]

At this point, I could deny your statement and discuss the relationship of Melkor/Morgoth to Lucifer/Satan, but I won't, as it would be veering off topic.

Since Melkor is no longer counted among the Valar(as stated in the silmarillion)and satan is not considered to be an angel following is fall to evil, or is thought of as a fallen angel, so your argument would be wrong.