Lets get this right...
God creates a spiritual realm (Although why he would need to create a spiritual realm to begin with is anyones guess as he himself abides in a spiritual realm, but nevertheless..)
So he creates a creature, the devil, in a spiritual realm.
God then decides to create a material realm.
This spiritual creature (the devil) then rebels against God?
So God decides to cast this spiritual creature down to his 'perfect' material world. (Why?)
This spiritual creature (the devil) then leads his material world astray?
So, not only has God created a spiritual realm that rebels against him, but by casting satan down to Earth, has also ensured that his material creation would also be deceived into rebelling against him??
And all naughty boys and all naughty girls will agonize and fry for all eternity Amen!!