(In response to: "I’d ask him why he demanded animal sacrifices, and why he murdered the firstborn of Egypt because he was annoyed with their ruler.")

The answers to these questions are actually in the bible, but you have to take the time to re-read and study it. The original plan of God’s was NEVER to have His animals be killed for sin— but He made the covenant with the human race that when one sinned against God, blood must be shed as payment for those sins. This was done by ‘passing’ the sins onto the animal and then killing the animal. God did not want this to go on forever and this is the entire reason Jesus was born, lived, and died. He was the ultimate and last blood sacrifice for past sin, current sin at the time and future sin of all who accept Jesus’ blood covering.

Also, Egypt was a mighty nation that was stubborn and mocking God and His people. Time and time again he gave the people warnings up to that fateful day. There is also HEAVY symbolism about the coming of Jesus and future events, in the events of the plagues and the story of Exodus. God does not do things arbitrarily nor does He do things out of revenge or evil. He leaves clear warnings and signs for people to follow, He encourages positive ways, and He desires that all people be saved and save and happy. But people can be easily deceived by their own heart and minds.