That seems contradictory like many things in the bible
There is a difference between body and soul.
There are at least two ways to internalize scripture. Some take a narrow position that every word is literal. You are an agnostic that takes this narrow position of the Bible.
Others of us study science, archaeology, and literature with all its various forms and take on a broader position of Biblical writings.
For example, particularly in Islam, the position on how God works is very detailed. For example, one cannot raise the little finger without it being the will of God. A single raindrop cannot fall without it being God's will. The Twin Towers fell because it was the will of God. The plane heading towards DC crashed because it was the will of God.
Others put free choice, weather, and geological events into play. Sure, since freedom of choice was granted to us by God, we understand why some have a strong take that ALL is therefore the will of God. Since creation is God's work, then the geological events and weather is ultimately the will of God.
No one from the flood era is still alive. Therefore, it is the will of God that they all died--if not in the flood, then within a hundred years of the flood. Will of God. All bodies dead.
Those of us who love scripture (or at least most of us) are not bothered by people who have the opposite take on the Bible than we have. If people want to believe that the entire planet was covered with water, including Everest; if they want to believe polar bears and penguins were on the ark, what is the harm? If they choose to believe God sent the flood with the intent to kill bodies, also not a problem, because they believe that those who were good or innocent were taken to a better place--and the evil was punished.
You, an agnostic, believe that God killed humans, but do not seem to believe in an afterlife for either the good or the evil.
Basically, Bluesman, you read the Bible and take the position of the thirty percent that the Bible is literal. You argue with me the narrow view when I am one of the seventy percent who has always taken the broader view (result of Catholic grandmother and Catholic schooling)--not to mention the broader position taken by the non-Catholic members in my extended family. Somehow, my family missed out on being part of the thirty percent who accept the narrow view.
However, I do have friends/acquaintances who do take the narrow view. They are lovely people, and their lives have not changed one whit by believing the planet was under water, just as my life has not changed one whit by believing it was a localized flood. What brings us together is our belief in God and that He has the world's best interests at heart--both in this life and what comes after.
So you go ahead with your own beliefs that there are at least three Gods and that the Bible is a literal work, but we don't know if One God, let alone three actually exist. Go ahead with your own belief that any believer has a God who is out to get them, if that is the conclusion that satisfies you.