Íluvatar's opponents?

[Yavanna Kementari]

From God and Ilúvatar's point think of it like this:

" And we know that all things work together for good to them that love God, to them who are the called according to his purpose."

Ilúvatar can do anything he wanted to do with Morgoth, but chose not to. Why? It is not for us to know the whole of Eru's purpose.
I know this personally, I was there singing when Morgoths voice tried to over come the Ainulindalë
Then Ilúvatar said to him:

Mighty are the Ainur and mightiest among them is Melkor; but that he may know,and all the Ainur, that I am Ilúvatar....Then the Ainur were afraid, and they did not yet comprehend th ewords of that were said to them; and Melkor was filled with shame, of which came a secret anger.

This is the begining of Morgoths fall.
Ilúvatar has no opponents only vain imaginations of those creations(made by the thought and word of Ilúvatar) wishing to oppose him. I hopw this answers your Question! [img]smilies/smile.gif[/img] -{~{~> Yavanna