It was actually a trick question. God was not Created, he has simply always existed. So technically NO. God has no opposite. Satan was created just the same as every other angel; since this is the case, no one can "be" God. It is also why God wins the battle. The creation cannot become greater than the creator.
Satan in all his fallen glory could never replace God. He could never "be" God. Satan is powerful - even Michael wont take Satan on one-on-one. You and I should be fearful of Satan, but not live in fear of Satan, becuase we (by adoption into God's family) have overcome Satan.
But remember Job. Job was protected by God. Satan could only do what God allowed him to do. We have a greater protection than that. The Holy Spirit lives in US! Job didn't have that special relationship that we have!
So, what do you think about that?