If there is a God, why is there so much evil in the world?

God allows evil because He wants us to have a choice. He didn’t want to make us mindless robots that just do whatever we’re told. He wanted us to love Him on our own free will. And people make bad choices sometimes. They’re influenced by other people, emotions, and whatever is going on around them. And Satan uses bad situations to turn us away from God.

If God is truly God, why doesn’t He do something about all the tragedy and death?

Because, well, suppose He did. Suppose He cleaned out the world so no sin was in it. We’d lose our free will, and our sin nature would probably ultimately mean that we’d be wiped out too, because we are sinful. And you can hardly say He’s not doing anything. He works in the lives of those who love and serve Him, and He uses them to reach out to people who need Him.