Only God has power over life and death. When a person decides who lives and who dies (like President W. Bush, objecting to the al Qaeda killing 3,000 people in the World Trade Center bombing (aka 911), then killing a million Iraqis because he objects to killing) he takes on the role of God. Only God should decide what the effect of killing should be, because only God knows the future.
If, on the other hand, a human was able to see the future, and had the intelligence of God to know how killing a million Iraqis would affect the future, then perhaps, he, too, could play God.
But, God has a position of respect that no human has, since God, and God alone, created the universe, and no human had any part in the creation of the universe.
Thus, when God kills (Noah's flood), and millions of innocent people are killed as a result, God might have had a plan that we could not see.
Also, when God had a baby with Mary, who, at the time, was betrothed to (but not yet married to) Joseph, God did what he commanded humans not to do (covet other men's wives....though technically she was not yet anyone's wife). It seems to have worked out well, since their kid was Jesus. Sure, other mothers brag...."my son is a doctor" but it's very difficult to top "my son is Jesus Christ."
People are constantly asking for forgiveness of sins that they don't think that they even have. Perhaps we should forgive God for having a baby with Mary and killing much of the world's population with a flood (Noah's time)?
Man was made in God's image, and man is flawed. Does that mean that God is flawed?