So... the real world provides no basis for truth vs. untruth, therefore we must invent a magical "supernatural" realm (where cause & effect are not related) & simply assert that truth lives there?
Ohhhhh kaaaaay.
Some would call it an unmistakable/undeniable truth.
The modern skeptic, with his/her committment to philosophic naturalism [nature is all there is] is faced with the unfortunate, and ironic dilemma, of having to sustain their belief system by, or on, sheer faith. This, after presumably rejecting faith as an attribute of the less educated masses.
"The LORD confounds the wisdom of the wise".
Brian.