(Warning: bookworm discussion ahead)
I haven’t seen the Odd Thomas movie, but I am hesitant at best. Most movie adaptations are awful if you’re a reader.
FWIW, Koontz was a practicing Catholic last I heard, and he’s definitely Christian-friendly at the very least. His style is easy to “slip into” but he can sometimes be preachy, which annoys me even if he’s preaching something I believe in.
I like Odd Thomas, but it is something of a time sink. An earlier duology, “Fear Nothing” and “Seize the Night” are similar in theme and flavor without being quite as long. “Watchers” and “Lightning” are earlier works that are generally well-regarded, and I have a soft spot for both “From the Corner of His Eye” (quantum physics with a religious spin) and “One Door Away from Heaven” (UFO culture, anti-euthanasia, similar religious spin).
If you don’t mind straight-out fantasy, you might want to look into Jim Butcher’s Dresden Files series as well. Action, reasonably twisty plots, fall-over funny, and excellent portrayal of his Christian characters, who are neither saints nor hypocrites.
I've often found great tips from fellow FReepers on movies, books, TV series, songs, etc.