Truth is derived by logical deduction from self-evident principles. There is rational certainty in arguments for God. The rationally inescapable is the real. Unless the law of non-contradiction holds, there is no possibility of knowing truth. The mind is not a blank slate, or nothing could ever be known.
Reality is knowable.
It is invalid to move from thought to reality or from the possible to the actual. Logic is the recognition of the order of reality, it does not create reality. The rationally inescapable is not the real. A triangle must have three sides, but that doesn't mean one exists at all. It is logically possible that nothing exists at all.