Allegorical with a quest and a good prince, written by an evangelical Christian man or two, maybe associated with Cru (then Campus Crusade for Christ) from the 80s or 90s
My dad worked for Campus Crusade for Christ in the 80s and 90s. He brought home two standalone paperback fiction books between 1995 and 2003 that I, then in middle school, really enjoyed. One was Bright & Dekker's Blessed Child (I was a precocious reader). The other I lost and haven't read since, and haven't been able to find any of the many times I've searched for it. My description is therefore unfortunately vague and possibly contains actual errors, elements I mixed in from some other half-remembered book.
It was probably between 200-300 pages. I think the cover might have been slightly textured. It might have had a townhouse or a dove or a bright sun on the cover. The cover was bigger than most mass-market paperbacks, but not as large as most hardcovers. I think it was written by a prominent evangelical male author like Bill Bright, but I might be misremembering. It was originally written in English.
The most prominent detail I remember about the plot is that it involves a benevolent prince, whom I think was somewhat allegorically related to Jesus. I thought I remembered his name was Prince Morningstar, but every time I've tried a search based on that detail, he's an evil character, so his name might be somehow reminiscent of "Morningstar" but not quite the same, like "Bright star".
I think there's a kid—a boy, or maybe a boy and a girl—on a journey in some kind of vaguely dreamlike or heavenly fantasy world? Maybe trying to find a king or a kingdom and get back home? I think there might be a dove involved in this somewhere, either on the cover or as a motif of some kind.
That's all I've got, sorry.