Tim Keller’s book “the Reason for God” came out recently in French. I ordered two copies, one for myself, and a spare one to lend or give away. It is a very good book, a bit heavy at times, but it is worth the effort. It was written for unbelievers in mind, but I found it helpful because it helps articulate answers to the doubts people raise concerning Christianity. Here is a video where Tim Keller explains the aim of his book:
Introduction to The Reason for God from Redeemer City to City on Vimeo.