I was thinking of David Bentley Hart. But the question here might be semantic. You might be assuming an elitist notion of sophistication, whereas there's also a mere formal aspect of it. A sophisticated argument would contrast with a vulgar one in that the former is subtler and not so crude. The Greek Orthodox Church took onboard more Greek philosophy without taming or dumbing it down so much. However, the systematic Western theologians, like Augustine and Aquinas, were likewise relatively sophisticated to the extent that they combined Christian theology with Greek philosophy. I mean they were sophisticated (learned and academic) compared to the folkloric worldview of an illiterate medieval peasant.

But a sophisticated argument can also be sophistical and casuistic, which means it's less authentically philosophical and more a kind of gaslighting or propaganda. I'm thinking of sophistication here as more a formal matter, not as a guarantor of truth.