For the Thinking Man.

[RobbyPants]

Atheism is a close ended belief system where everything is explained in terms of the natural order of things.
And so ,no god or gods , only nature .

Nope. Atheism is a lack of belief in gods. You can still totally believe in unicorns, ghosts, and leprechauns and be atheist. You're describing something more like naturalism.

But the problem for the godless is how to explain rational thinking.
Since thoughts are events, all of our thoughts should be fully explainable in mechanical terms, and not to a person’s free-will .. But any thought which is not guided by what is “true” but only by mechanical , physical needs ,is not rational.

First of all rational "thinking" is out we experience our own consciousness. It's not an entity unto itself. Secondly, a thought process is rational if it follows logic. Regardless of whether it came from a person's brain in a deterministic set of chemical reactions or came from a person's soul is beside the point.

No belief is rational if it can be fully explained in terms of non-rational causes.

Now this makes no sense. Both because it's a completely baseless non sequitur, and also because theism has never "fully" explained anything. Every theistic argument raises more questions than it answers. By your logic, I could explain rational belief with leprechauns.

but there's more : any notion of good and evil, right and wrong, love and hate, etc., must also be treated as mythical. nothing more than helpful ideas , but ideas with no existence ( ontology) of their own. Life would then be essentially meaningless since its ultimate goal is mere survival, an unattainable goal in a world where death is guaranteed and final.

I wouldn't say it's meaningless. I find plenty of meaning in my own life. Just because I don't believe in any gods doesn't mean I can't enjoy my time here.


Now, I see where you're trying to go with this, but your theistic way of thinking has tainted your entire thought process, and you're not really looking into what it is to be atheist, or looking at what atheists believe.