Morgoth is NOT an allegory of Satan
or any other evil deity
which one could equate with him. He is Prof. Tolkien
's personification of evil
. Tolkien has denied
and denied again that anything
in the Lord of the Rings
or the Silmarillion
is representative of anything
in the real world; it's not World War II
, the Shire
is not England, Gondor
is not France, Morgoth
is not Satan, the One Ring
is not the Atom Bomb
, and Long Bottom Leaf is NOT marijuana
Tolkien created these worlds as an environment for his languages to live in, and greatly supported the idea that he was just a historian rewriting ancient tales of mythology (The Red Book of Westmarch).
In short, yes, Morgoth could be EQUIVALENT to a Satan, but should never be seen to represent Satan.
This node does a very good job at looking at the subject in depth.