I agree with you, I am also Christian. In real life, I have the same standards of a God who knows everything, sees everything, can do anything and is always everywhere. But this is a book. I have different standards in a book because we are already bending the rules of reality with magic, which is something that my God could theoretically do if He was so inclined. Of course, I believe in a God that can do anything, yet always follows the laws of nature. Sometimes, we don't understand all the laws of nature, but He does.
I don't know, all I am trying to say is that, this is a book, and if a book did have a God that met my standards, then the storyline would be... different. If the God was evil then it would be LITERALLY IMPOSSIBLE for Him to die.