Why Creationism

Posted a message recently and got a garbled response to the question asked. Why do we need Creationism, or for that matter Genesis? The New Testament functions quite nicely without the Old Testament and avoids all the controversial materiel. Example : God created everything and that must include the devil. God wanders off leaving his creations in the company of a being God knows is evil, leaves a deadly fruit tree where naive Adam and Eve can eat thereof and when these two innocents are duped into eating the fruit what odes God do? Throws them out of paradise. What does God do to the evil one? Commands him to crawl on his belly which, if I recall, is what the serpents did prior to the so called punishment.
Q. Why, if God loved his creation, could he act so carelessly?
A. Why he was testing humankind.
R. Really. I only count two that were tested. The rest of us weren't born yet and I don't see the logic of my suffering for the mistakes of people long before I came on board.
A. Well, it was passed down genetically.
Q. Well, if so then why didn't God sterilize one or both to stop the spread of evil?
A. Oh, God couldn't do such a terrible thing.
Q. But he could drown most all life on earth in the flood of Noah? Maybe fundamentalist should consider circular filing the Old Testament and concentrate on the words of Jesus Christ. Jesus said "all have sinned" and I think it is a very poor showing of faith when one has to resort to the Old Testament to confirm what Jesus said.