I agree that it's a bit reductionist to boil this down entirely to "Christian Apologetics," I think you'd have to do some serious rationalizations to see how the notion of human finitude, time as the limit of cognition, is not originally a Christian notion, or at least is not informed by secular interpretations of theology such as the first place where this claim is made, Being and Time. Which is even more interesting because even Heidegger moved away from time as binding finitude and eventually came to the position that cybernetics would replace philosophy, that fundamental ontology would not withstand technological advancement.