It's odd that you're imagining that the concluding that the person's mother is Ayn Rand and they are dedicating a book to God is a sensible reading. Having known some Randoids the non-Oxford form's interpretation actually seems more plausible to me, but the sentence is nonsensical whatever punctuation you use and neither form seems any less nonsensical to me.

If that's the best case they have against the Oxford comma it seems to be an exception that proves the rule.