The new book is David Kinnaman and Gabe Lyons' Good Faith: Being a Christian When Society Thinks You're Irrelevant and Extreme. It looks at the increasingly negative view that Western society is taking of Christians and Christianity and suggests ways to help turn that situation around through conveying the value of the Christian faith in the lives of real people today.
The earlier book is Vishal Mangalwadi's 2012 work: The Book That Made Your World: How the Bible Created the Soul of Western Civilization. This recent classic ties in by showing that it is Christianity that has given Western civilization virtually everything positive that has made it what it is.
These two books both demonstrate that Christianity is anything but irrelevant in our world, and they do so with careful documentation and argumentation that makes them wonderful resources for also helping non-Christians to see that. You can read the reviews here.
On the Reviews page of our sister site, we have also uploaded three more suggestions to our list of new and classic books that we think are worth your time. You can find the new suggestions and check out the older ones, if you haven't already seen them, here.
Also, if you haven't already downloaded and read our own latest e-book on the Book of Psalms, you can get it (free) in different formats for reading on a computer or e-Reader. Spotlight on the Psalms takes a different approach to this wonderful biblical book than you may have seen before, and judging by the comments we are getting, we think you may find it both enjoyable and helpful. Like all our e-books, you can download it without cost here.