Well, not to get too technical, but if, for example, a person believes God exists, the person has justification to believe that God exists, and if God does in fact exist, then
by definition that person really does
know that God exists.
The question then becomes one of whether or not the person is actually justified in her belief in God.
Added by edit:
Oh, never mind. I think that we are interpreting anastasia's post differently. I'll let her explain what she actually meant. I apologize for butting in.
Edited by Chiroptera, : No reason given.
I have always preferred, as guides to human action, messy hypothetical imperatives like the Golden Rule, based on negotiation, compromise and general respect, to the Kantian categorical imperatives of absolute righteousness, in whose name we so often murder and maim until we decide that we had followed the wrong instantiation of the right generality. -- Stephen Jay Gould