Where then does evil come fom? Can we know why God has always existed or why there is a God as opposed to there not being a God? No we cannot. Neither can we know how or where evil comes from or why it exists.
It may be that evil has always existed. Left needs right to have meaning or existence. Good needs evil for the same reason. God may have found a way to neutralize evil for good. Lets hope that happens sooner than later.