One main theme might be redemption. In Christian literature, the concept of falling from grace often leads to a journey of finding one's way back to a state of grace, which is a form of redemption.
I'm not sure about specific reviews offhand. But you could try checking on Goodreads. It's a great place where readers often leave their thoughts on books like 'fall from grace a christian romance novel'.
Unfortunately, without more information, I can't determine the author of 'fall from grace a novel'. There are so many novels out there, and this one isn't widely known to me. You might search for it on literary websites or ask in a book - loving community.
I'm not sure exactly as I haven't read it. It could be about a character's moral or social decline, perhaps they lose their status in society, or their good reputation is ruined in some way.
It's hard to say for sure. It could be inspired by real-life situations but transformed and embellished for the sake of the narrative. Maybe some parts are true, while others are made up.