Your book idea is an interesting concept, but as you know by definition antheism means no believe in God at all. I once wrote a book called "Dialogues with the Devil".When I started this book I had no idea the terrible danger that I was placing myself in by focusing on detailed conversations and an imagined personal relationship with the evil one. I think that the premise of your book has great credence, and is definitely something that is a viable issue today. I only wonder about the title - have you considered something like "The Christian Pretender", "False Christianity", or something similar? It's just a thought. There is another book I read recently called "Satan's False Christianity" which might serve as a research source for you as I believe it shares many basic ideas in common with your proposed theme. Your book might also want to take note of that minister who announced that she was an atheist and actually wanted to continue to sermonize from the pulpit. This was just last year, and I cannot mention the name of the Church, but this was a Canadian minister out of Toronto. She actually announced her atheism, taught atheism, and fully expected to keep her job. Oh boy, right? This story might be of interest to your book. My only other humble suggestion is that each time you sit down to write or research, pray a prayer of personal protection so that you do not become seduced by the concepts and ideas that you are being exposed to. It really does take very little to be lured into the wrong part of the garden. If at any time you start to feel sympathy for your subject matter, atheism, it is my suggestion to stop work immediately and spend intense time in prayer with the Lord.
I did not publish my book. The reason - I had to ask myself if it served the greater good and I in the end I did not feel it was serving God. I came to realize that I was feeding my ego and my bank account, and worse yet, that the book itself could possibly have made a vulnerable reader go astray. I simply did not want to be responsible for having that happen because of me. I must say that when I made the decision to scrap the project my uncle the priest was very relieved. He suggested that next time I decide to write, perhaps "Dialogues with the Creator" or something similar might be more appropriate. I agree.