http://www.amazon.com/New-Earth-Awakening-Purpose-Selection/dp/0452289963
I recommend as just a general introduction to just being mindful, how to deal with emotions,ego, Being,concepts of Zen, concepts of Christianity and concepts of Buddhism.
It doesn't focus on religion. It's more on dealing with your internal emotions and voices. In other words, not letting your emotions and ego control you.
It has some good mantras/sutras. I am not sure the difference.
"Caution. All structures are unstable."
"Is that so?"
I am sure you can find it at a library as I did.