I agree that attempting to prove the truth of the Gospel, independent of any frame of reference is fruitless, but that also manifests a weakness in rationalism.
The veracity of God is available to all in any domain. It really doesn't matter how many comparative religions don't believe in God through faith in Christ. That will never over power Him.
Of course. We are finite beings, with finite linguistic and conceptual endowment. Does an American bee "know" it is in America? Realizing our weakness, our limitations, our "bee-ness" increases our awareness of God's immensity and incomprehensability. Realizing that we only know that we don't know is a giant step theologically speaking and a true lesson in humility.
It really doesn't matter how many comparative religions don't believe in God through faith in Christ. That will never over power Him It's an esoteric conviction. Not a proof.