RedRain, Starfish
RedRain, you are very close to being right as rain when you observe: "Asserting that THERE IS NO GOD is similar to asserting that THERE IS A GOD. [Because] You cannot know that something does not exist...".
(Capitalization is mine -Andy.)
Starfish puts it another way:
"So if theism lacks sufficient evidence, wouldn't it follow that it doesn't mean it's not true, just that there was insufficient evidence to proclaim it true?"
I wish every theist would read both your comments and the following answer. It might clear up some of the confusion on this topic.
(I will provide the shortest possible answer to serve its purpose. None of the following is my opinion. Indeed, in some cases I am paraphrasing from articles I have researched to ensure my impartiality. It is information easily verifiable by the reader, and I would encourage this research.)
First, the rules of Logic and Science require a basis (deductive or inductive respectively) for making an assertion, or it must be disclaimed as invalid or false. An assertion, without proper evidence, is not accepted as "valid" in Logic or "true" in Science. That is the most fundamental requirement that defines and ensures critical thought. In layman terms it means not believing things you are told unless there is evidence to back it up. Deny this and you abandon critical thought, logic and science.
Next, it follows and it must be presumed that the onus for evidence rests only upon the person making the assertion, the assertion in this instance, that a god exists. Note that the mere mention of ones belief in God serves (logically) as an assertion that a god exists.
IMPORTANT POINT: Is the Atheist making an assertion when he says "God does NOT exist"? This is a very common and understandable confusion. A person who rejects an assertion does not need to provide any justification for it. Rejecting the assertion that "X is the case" by replying "No, X is NOT the case" is not making an assertion. The evidence has to be provided by the party making the assertion. The person rejecting the assertion needs to provide nothing at all. Be sure you understand that the person rejecting the original assertion is off the hook, as they should be. To further drive the point that it is not the Atheist who is making the assertion, ask yourself why would an Atheistwho is by definition of the word "A-Theist" an "anti-theist" one day proclaim to the world IN ABSENCE OF ANY INITIAL CLAIM TO THE CONTRARY that "Hey, there is no god". Undeniably, indeed logically, the Atheist's position is not a proclamation, but a rejection of an assertion already made. (Very strictly speaking, the Atheist's rejection should take the form "It is not the case that your assertion 'god exists' is true", instead of the form "God does not exist". But I'm splitting thin hairs.)
To avoid this whole situation some Theists will declare that their personal experience is justification to themselves. (MoonWater has stated this as her position on this forum.) This quaint variety of solipsism seeks refuge in the comforting notion one's own sense of truth and reality is sufficient to "know" the truth. But if we grant that one's private experiences and thoughts are enough to substantiate these subjective truths, then the same must be allowed to hold true for others. This invites the inescapable conclusion that two people with opposite "truths" are both correct. Farewell to science, logic and rationality!
Carl Sagan once asked, What's the difference between an invisible, incorporeal, floating dragon who spits heatless fire, and can never be found... and no dragon at all? Sagan concluded that such an unprovable assertion is indistinguishable from being plain false. The point being, that there is no truth to claims for a god's existence, since these claims are as unsubstantiated and nonsensical as Sagan's forever hidden dragon. There is no use in even asserting such empty statements, and every reason to reject them as false, or worse, meaningless. This does not preclude that such creatures, fire-breathing or divine, might exist (perhaps near the North pole...Ho Ho Ho). But amid the embarrassing void of evidence to warrant a reasonable person to assign any amount of truth to such assertions, we are obliged by the rules of reason to reject them as false.