Even my romance segments are Catholic -- because unlike most romance novels, my characters don't jump into bed with each other during an adventure that lasts a week, or a month at the outside.
Why so Catholic?
Um ... because I'm Catholic?
Though I must admit, even the reviews I've gotten from atheists liked the way religion was handled. It's strange.
But the answer still stands, and it's simple: Catholicism informs my view of reality, mostly through Thomas Aquinas. Why? Because I have degrees in history and philosophy. Yes, I'm a nerd of many colors. But still, it really does inform me on reality.
Now, obviously, I'm not using Thomas Aquinas to explain science to me. But Aquinas does come in handy to go the next few steps beyond what science tells us. And, for the most part, Aquinas still works (I say "For the most part" to cover my backside on this, I haven't read every last word Aquinas has ever written).
But then again, I'm strange. I don't really have faith that God is real. I Know He's there. Don't ask for the details, but let's just say that I view it as common sense. (Am I dissing atheists? No, just the ones who throw insults at me -- I'm looking at you, Dawkins.) There's no other way for the world to work, really. Though my brain's kinda funny. Does this make me super-Catholic? No. Because I'm still human. And my preferred deadly sin is wrath -- so much so I'm relatively certain that I might be a spree killer if I wasn't religious.
Being Catholic really does just inform my worldview. This goes from how the world works to Vatican Ninjas. Yes, Honor at Stake has Vatican Ninjas.
So yeah, my head works funny.