2.5 stars.
There is potential here, but it's unrealized.
The copyediting needs work. Random punctuation errors, bad punctuating around dialogue, oodles of commas with cumulative adjectives, past tense in internal thoughts, POV shenanigans, inconsistent use of italics, awkward wording, "slammed on his breaks"--all things that a solid copyediting would clean right up. Maybe the following books will be in better shape.
As for the story itself--this book was largely focused on giving us the characters' backstories (via little flashback-type sections). I agree that the information we got about the various characters is helpful (well, I guess it is), but it made for very choppy reading. And I'm not sure I buy into this conversion camp, because we honestly didn't see much of it. How are they converting the kids? What are they doing? It's not enough to say "the kids are at a conversion camp" and then conduct the story without giving us details--you have to show us what that means. I want to see the converting, the practices, learn what the school is about. Part of the thrill of reading a story about something controversial like this is getting to "experience" the other side of things--hearing the sermonizing, seeing behind the curtain. And maybe there's more of that in book 2, but a few kids in a classroom with a teacher who's obviously not fully on board with the program doesn't paint a very convincing picture of this school/camp.
This book is really like the introduction to the story--setting up the characters and plot with no real beginning, middle, and end. It wouldn't be a horrible idea to wait to read this when book 2 has come out so there's a bit more to sink your teeth into--if you're already feeling inclined to wait a bit.
I'll see what reviews are like for the second one before I continue with the series. And I'll cross my fingers that the author decides to release an .epub version somewhere, too. When I saw this was only available for Kindle, I almost skipped it right there. epubs <3