Again, if God exists, then He knows all things past, present and future; He knows the hearts and thoughts of all men. He is perfect. He is just. It's pointless to try to judge Him by atheistic standards, ethics or morals as those are not even binding on themselves, much less God.
That's a leap you are taking: if God exists, then he is all these other things like perfect and just.
You are running around in circles:
- My God is perfect and just.
- How do you know?
- Look at all the stuff He has done, it shows how just and perfect He is.
- Mmm....okay, but what about allowing humans to be kept as property when He could have easily forbidden it, just like he forbade a lot of useless stuff? (Or insert other objections)
- That's also perfect and just, because God is perfect and just! Don't you dare judge Him!
This line of reasoning sounds like
- All cars are red.
- Umm, what about this blue one?
- It's also red, because all cars are red. Besides you are not qualified to question colors because you don't accept all cars are red!