It is basically a series of essays, arranged in a kind of order, purporting to run thorough the various philosophies with regard to life, the universe and everything, although Adams did it so much better.
The author poses a number of questions in three major areas, and then attempts to address them. And it turns out that the answers are predictably: a deity. So his answer to ‘what’s it all about, Alfie?’ is basically an argument from design. This book is a creationist tract, minus the young earth belief.
Although the author claims to have read widely in a variety of disciplines in his search for truth and answers, it would seem that after scrabbling around in what appears to be a half-hearted manner in the realms of physics, astrophysics, religion and the sciences that the results he was looking for weren’t there, and thus, because he does not care for the results he does find, he dismisses the science and reverts back to saying that our inevitable conclusion is that this whole universe thing all came about because of a deity with a plan. Maybe it did — the definitive answer to that is not in yet — but this mashup of schoolboy all night conversations powered by too much beer and spliff did not convince me.
The Deity Did It is not a guide, it is a conclusion, with not much of anything to back it up other than earnestness and a good heart.