Now I have seen nearly everything.
You have condemned God in your tirade, and justified Satan in the process. Absolutely amazing.
First, God cannot murder. Since He is Creator of all, He has the right (indeed, right!) to do with His creation as He sees fit. When His creation rebels against Him, He is patient and long suffering with them, until He has had enough, and that creation has gone to the point of no return. When the flood occurred, God had been patient with mankind for over 100 years AFTER He told Noah to build the Ark. During that time, Noah preached righteousness, and the people would have none of it.
Next, you say that if the Bible said it was okay to have sex with kids, people would be doing it all over the place. The problem is, the Bible doesn't say anything about that, except to condemn sexual immorality in all its forms. God is holy, and won't put up with abominations like that.
Next, you talk about slave owners justifying their actions with Scripture. That is true. People who commit incest will also try to say that "It's in the Bible!" hoping for some leniency. The Bible states the way things are, as well as the way God wants it to be. Just because there are cases of incest (Lot and his daughters, Ammon and Tamar his sister) doesn't mean it's okay with God. Slavery in the Bible was completely different than slavery in the US and Great Britain. In biblical times, there were no bankruptcy courts or welfare. If a person's debts became too much to bear, they had to sell themselves to one who could pay their debt in return for their service. Those who owned slaves in the US had a poor understanding of what biblical slavery was about.
I really don't know what your problem with God is, but you must realize that it is either a misunderstanding or pure rebellion on your part. It isn't God's problem. As it is written: "...who are you-mere man that you are-to talk back to God?" (Romans 9:20)