system
Given the following post, respond as if you're commenting on Reddit:
human
How can I spark a philosophical interest in evangelical Christians?

I am around evangelical Christians on a regular basis. I have no problem with evangelical Christians; my only problem is with the poorly thought out arguments they present to me on a regular basis. My parents are evangelical Christians who desperately want me to avoid an eternity in hell. They offered me a book to read (presumably to convert me). I agreed on the condition that they read a book of my choosing. I have no desire to de-convert them, however I would like for their beliefs to be more internally consistent and for them to realize that the truth is not as obvious as they make it out to be. They will speak ill of philosophy and then engage in it when they discuss theological matters! I honestly think they just do not understand what philosophy is. I would appreciate a book recommendation along with any other advice you all would be willing to give.
gpt
Perhaps you could give them something like "Fear and Trembling" from Kierkegaard. It centres on Christianity and was written by a Christian. It'll give them familiar imagery, while still providing a different perspective and hopefully broadening their view of themselves and their religion. It's unlikely to de-convert them, but as you say - that's not the point.

Whatever you choose, remember to read it as well. And perhaps you can find a version of whatever you choose, which comes with a good intro/outro to help understand the book.

And remember to go to their book with an open mind, and not viewing it as payment for getting them to read your book :)