Books that explain Judaism to goyim in a way they can understand

I am Jewish and my girlfriend is not. I am actually fairly religious but met my girlfriend prior to becoming religious. Please can we leave any conversation about how I should be with a Jewish girl alone for now.

My girlfriend is fine about it, very supportive and has no issue with my religion. Her father not so much. He has a very single-minded view of religion generally, and seems to assimilate all religions into one. He’s kind of a reddit atheist, believing religion is outdated and only exists to comfort people about life-after-death and ‘control the masses’, and has been rather confrontational/disrespectful of my dietary restrictions in the past. I highly doubt I would be able to get him to read the anything that is Jewish in nature, but Christmas is coming up and of course their family celebrate it. He usually buys me a Christmas present, so I buy him one in return. If anyone knows of a book that deconstructs the uniqueness of Judaism from a more secular point of view that I could give him for his Christmas present, please recommend. Although not secular, I was thinking of A Guide for the Perplexed but he’s not the brightest and as soon as he found out who the Rambam is he would probably write it off completely. Does anybody know any books like this?

Thanks for your help