You don't like Kincaid's work - I would suggest it's because he's a Christian, and not because you think his art is unrealistic.
Asher Durand painted some amazing and dramatic Christian allegorical pictures, so did Thomas Cole. I like them both. They handle light, structure, and perspective extremely well. Kinkade doesn't, and that would still be true were he Jewish, Muslim, or heathen Chinee.
Calling oneself a "Christian artist" is not an excuse for bad technique. Religion, doctrine, or imagination has nothing to do with messing up perspective or painting a scene as though there are three suns in the sky (unless I suppose you were illustrating a science fiction story.)
(BTW, I'm an unreconstructed 1928 Prayer Book Anglo-Catholic, married to a Methodist preacher's grandson. So much for your off the cuff conclusion.)
Actually, Kincaid is a Mormon, a faith that offers a convincing superficial simulcrum of Christianity spread as a gloss over a heart of bizarre and unreal cultic mind-warp.