Hi guys, I'm an atheist and I've just been converted?

So I read this book (well, actually, several books in it) that tells the story of one man who saved us from an evil creature. The book chronicles his life from his birth. Some evil dudes tried to kill him when he was a baby, but he survived. He could do magic and made miracles happen. He tried to expose evil, but the authorities didn't like it and tried to punish him. He even drove a demon out of that prostitute, Ginny, by getting rid of some diary. Thanks Harry, for saving us from Voldemort!