The test was more for Abraham than it was for God. And yes God is absolutely just in his judgements. Like I said before, the only problem is that you don't like it, so you reject it. These are accounts in the bible, so the bible needs to be the basis for our arguments. You cannot justify your position biblically that God didn't have morally justified reasons for his judgements, but I can justify my position. If you want to reject God, then that's your choice, but when formulating an argument based on literature, we need to take into account all of what that literature states about the subject of our arguments. Also, prove that it's mythology.