God didn't cause the flood to happen because everything was so good.
God didn't cause the Genesis flood to happen at all. Like the garden of Eden, it's a myth. When describing either, the words "In the story" are understood to start each sentence. The geological, genetic, physical and cosmological evidence against there ever having been a real Genesis flood is overwhelming.
Adam could have lived forever if he didn't sin.
No, the story doesn't say anything of the kind. They were always going to die. Otherwise the presence of the Tree of Life in the garden makes no sense. Nor does the story
ever mention sin, or the fall of mankind, or spiritual death, or any of the usual Christian trappings.
God states [his] reasons for kicking Adam and Eve out of the Garden in Genesis 3:22-23. It was to stop them from eating of the Tree of Life and becoming like [him]. Read it for yourself, for goodness' sake!
I believe the Bible, it makes sense to me.
Then you'll know that ─
(a) exactly as I said, there is no mention of sin &c in the Garden story, and
(b) Ezekiel 18 says out loud and proud that sin can't be inherited ─
20 The soul that sins shall die. The son shall not suffer for the iniquity of the father, nor the father suffer for the iniquity of the son; the righteousness of the righteous shall be upon himself, and the wickedness of the wicked shall be upon himself.
In fact you should read the whole of chapter 18 of Ezekiel.
God did not tell anyone but Adam to not eat from that tree. If he did, God said Adam would die. If he did not, he would not die.
No, God said "
in the day that you eat of it you shall die" (Genesis 2:17). And the serpent said to Eve, "You will not die. For god knows that when you eat of it your eyes will be opened, and you will be like God, knowing good from evil" (Genesis 3:4-5).
God's statement was a lie ─ it makes no sense as a mistake ─ and the serpent's statement was true.
Why do Christians only learn about the bible from what they're told, instead of reading it for themselves? Why does it fall to me to tell you the Garden story NEVER mentions sin? When you know that, then you'll know that Paul's brief mention of the Fall is not supported by the Tanakh. The origins of that version appear to have arisen among Jews of Alexandria from the midrash tradition late in the second century BCE.