Why atheism cannot escape absolute truth

[Mystic]

If it's nothing more than an illusion, how would you know?

This is a good question, do you recall my answers and explanation in the past through out the years? 

We act as if these things are objective - that's what a healthy mind does.  But the fact that we act "as if" these things were objective is not evidence in and of itself that they indeed are objective.  You mistake the appearance for the reality.

I actually always acknowledge this. There must be something more to make us know. Naturalism cannot account for that knowledge. Only Theism can.