Why atheism cannot escape absolute truth

[Angrboda]

In the same way God is not deluded or unsure about himself being praiseworthy and of absolute value, we can witness that we are certain that we have objective value objective praise.  The question of whether we do witness or not, is different then how would you know? How would you know has been explained. If you do know or not know, is silly to argue over. I think all humans very well know objective praise and value exist. The same is true of free-will and perpetual identity. I'm not going to get into a yes we know no we don't argument.

You asked "how would you know?". That has been answered.

Fair enough. I wasn't looking for an argument, just an explanation.