What an amazing book; I read through it in one sitting. I thought that a lot of history would be boring, but it wasn't. Father Damick has a lively style that kept the boring parts from being, well, boring.
The best part for me is how he brings the ancient heresies forward in time, and shows how they are still being taught in parts of the Church today. Whole denominations are founded on teachings that the Church actually dealt with centuries ago. They have been repackaged and given new covers, but Father shows how there is truly "nothing new under the sun," and how and where many of these heresies still have traction in the modern world.
This is not a "gotcha" book, and there is no sense of "We're better than you because you believe this;" he makes that clear from the beginning. There is, on the other hand, a good grounding in what the Church has believed to be true for centuries, and precisely how the various false teachings deviate from that truth.
He also explores other religions: Hinduism, Buddhism, Islam, etc. and shows how, sadly, we do not "all believe in the same God," or are all "going to the same place." I was not aware of the fundamentally different views of God and the afterlife that these other religions have, but now I am on a much firmer footing when I talk to my Muslim and Hindu friends at work.
My only complaint - and it is a small one - is that I would have liked the book to be longer; I wanted to keep reading. I have since listened to his series of pod-casts, and there is a wealth of detail in them that, if included in the book, would have made it very long indeed.
This book is an excellent buy for any Christian of any denomination. It will not only show you what was taught in the early church, but how and why many Christians have drifted, or have been led away from,that fundamental teaching.