Over the years, I have kept a few things that my family gave me OUT OF LOVE or their version of it. In every case, I wanted to toss these things. When I hung onto them, they sort of ate away at me like acid. When I got rid of them, I felt much, much better. I gave away the book (it was a decent book, not like yours). The acrostic with my birth name on it? I tore that to shreds after hating it for fifteen years.
At this point in my life, I would have no trouble destroying a book like the one you received. If you recycle it, tear it up first. Doing so can be very satisfying and prevents anyone else from rescuing it intact.
ETA: I just read several pages of this book on Amazon. The author cleverly spins certain points ("LGBT people would say..."--uh, no, I don't think they would) and is extremely dishonest and misleading with statistics. Any reasonably competent reader should be able to see through him. In other words, most people won't.