Tackling time travel in a first novel is pretty brave. I did get a little lost in a couple of places, but it's a tough subject! I very much enjoyed the idea that someone would go back through time to create a religion. Kate, the heroine, is pretty likeable, and self-aware

Spoiler

(she recognized the irony of being rescued while wearing a "self-rescuing princess" t-shirt)

.

I initially gave this 4 stars, but considering that it's a YA novel, and a first one at that, I decided to give it one more.