Understanding this principle is really quite simple:
- God has chosen to reveal Himself. This has included many different methods (Heb 1:1-2), but for us, is in the Bible.
- God is always successful in His plans and purposes
But what about #1?
Some will say that God can only be known through a mediator.
However, this runs into the problem of "why can we communicate".
That is, we can only communicate clearly because we are in the image and likeness of God, and God communicates clearly.
If God does not communicate clearly, then we have no reason to believe that we can communicate clearly (or we are greater than God in this regard - and God is not God, back to effective atheism).
So, if God cannot communicate clearly, we cannot communicate clearly - and thus you cannot communicate your argument.