Does the Existence of Evil Point to the Existence of Multiple Gods?

Questions about whether the existence of evil points to the existence of multiple gods and why God needs to slowly improve our character here on earth if he’s going to make every Christian sinless at the resurrection regardless of how long each one was a Christian.

• Would the existence of multiple gods, some good and some evil, explain the existence of evil better than the existence of one God who allows evil?
• If, after death, God will give the thief on the cross the same sinless character as the Christian who lives to be 100, why does he need to slowly change us over time here on earth? Why doesn’t he just make us sinless immediately instead of at the resurrection?