Hi All,
I challenge any atheist to come and debate me on what truth really is. This is not for ego I want to reason with you and have a fruitful discussion. How do you know what u know? what is ur epistemology? How can u account for truth without God? where do you get ur ethics from without God?
I'm not an atheist, nor do I presume to speak for them, but given that no one has taken the bait, I'll propose a response to your question.
I would assume that there is such a thing as truth. If one were to say that there is no such thing as the truth, then they have just contradicted themselves by making a truth claim. Therefore it stands to reason that we can make truth claims based simply using logic, argumentation, debate, etc.
I don't quite understand the question on how one knows what they know. The reason I don't understand is that when I think of knowing, I think of this in terms of intellectual or rational knowledge which can only be known through the intellect. There are some who would claim other types of knowledge, but I wouldn't call that knowledge as much as things like experience, awareness, etc.
Another question would be how can we know the world around us? And the answer to that question is somewhat the same. We can only rationally or intellectually know the world around us by the intellect. This doesn't actually allow us to connect directly to the world. It only serves as a derivative to reality.
One can become aware of reality, but this can never be through the intellect as it only creates an additional mediator to reality. The bible talks of a mediator between man and God which is the closest thing to what I'm talking about. There can be no additional mediators without creating further separation from reality.
Most people today get their ethics from their culture. We have a social contract, and people who violate that contract and are caught, suffer the consequences. We're taught the difference between right and wrong, good and evil. Ultimately, these terms don't mean much to a lot of people. Too many people really have no comprehension of why they should do what they do. They just do the "right" thing in order to be accepted by society.