I'm both similar and opposite (yes, I can be both). I'm certain God exists and cares for us, but intellectual honesty requires me to admit I could be wrong.
I said I have a lot of respect for beliefs like Scalzi's, and that's because there isn't proof of a God -- not in the way we want there to be. If there were, the internet would have a lot less to argue about. And so of course I struggle with my own belief.
I'm certain God exists; I wouldn't be out here, doing what I'm doing, if I thought He didn't -- I'm just not that good. But why am I so certain? That's harder to quantify, and certainly I can't do it in a way that would irrefutably convince an atheist I am right.
But I don't believe blindly. As I said, I struggle constantly. I question why I believe what I do, and why others believe what they do. I question every word I teach my kids, refusing to teach the Sunday School lessons I was given unless I believe them myself. I frequently answer their questions with, "I don't know." I teach them what other people believe. Most importantly, I teach them that I won't ever make them follow God, that they have to make that choice for themselves.
To the point of this post, sci-fi/fantasy is usually so unabashedly atheistic, that I am always surprised -- quite pleasantly -- when it speaks directly to my own heart struggles. The passage below is from SFWA Grand Master Gene Wolfe's The Wizard. Sir Able, the narrator, is a knight more noble than any I have ever read about, who wrestles daily with what it means to be good and honorable. The sister of the king meets him in secret on an unrelated matter, but during the conversation, she asks him if he believes in God.
I'm sure it won't hit you the way it hit me, but I have to share it anyway, because I see a lot of truth in Sir Able's answer:
"Do you credit a Most High God?"
The question caught me by surprise. I said, "Why of course," stammering like the boy I pretended not to be.
"I do and don't." She smiled, and the smile became her laugh. It was music, but I never ached to hear it again as I did Disiri's. Even then, I thought her less than human, and that laugh was at the root of my opinion.
"I don't and I do." She cocked her head like a bird.
I bowed again. "Just so, My Lady. We can think only of creatures, of things He's made. Creatures are all we know, and can be all we know until we know Him. When we think of Him like that, we find we can't believe. He can't be like a creature any more than a carpenter is like a table."