I don't claim to know. Some people think they know though. Christians have been writing Apologetics books for a long long time that cover most all of the crucial issues. Atheist scholars have focused on writing single issue types of works. Very few atheist scholars (if any) have written a book covering most all the crucial issues. This one does that. In fact it's quite comprehensive covering issues not usually discussed. Do you have it in your library for reference? It is, after all, a reference work of 536 pages.