[stephenhuey]

I don't know much about Mac, but I'm sure he was inspired by others, as was Kreeft. There's a lot more besides the one you read, e.g.

http://www.peterkreeft.com/topics-more/20_arguments-gods-exi...

I've read the Handbook of Christian Apologetics by Kreeft and it tries to make these philosophical topics more accessible to the average reader. There are numerous speakers and writers out there, and you may prefer one of them. For example, Tim Keller is quite different and you can hear him here:

https://gospelinlife.com/downloads/literalism-isn-t-the-bibl...

I've enjoyed reading Dallas Willard:

http://www.dwillard.org/articles/individual/language-being-g...