Alexander wrote:

Hart is not the man to go to for systematic arguments of any kind. His style just isn't suited to it. But "The Experience of God" is probably the closest he gets, especially its chapter on God as Being. I think if you read it, you'll see why he hasn't presented a formal defense of God's existence - he clearly doesn't think syllogisms and pure reasoning are the way to go when talking about God.

I figured. He didn't strike me as the type to present systematic arguments--his style is almost  Chesterton-esque. He does mention in The Experience of God how he has tended to focus more on the experiential witness of God since he has gotten older. He does, however, have ample citations in the back of the book, some of which direct the reader to systematic arguments.