El Hombre Invisible said:
One's beliefs and the validity of one's beliefs are two separate things, otherwise I would say no-one is a theist because God does not exist. This is clearly wrong. The fact that beliefs are not absolute is irrelevant to describing those beliefs.
In a way, you're expressing my exact point. Each perspective (or belief) is valid in its own right. The wording, "no-one is a theist b/c God does not exist," seems contradictory in itself, however I still see what you're getting at. And, I hope I didn't come off as implying that atheists believe in God or everyone believes in God. I was referring to the notion of God. Something everyone here has explored and reached a conclusion on. Of course the conclusion reached depends on the initial notion expressed in relation to one's own thoughts.
Also before I go on, I want to clarify one other statement. When I mentioned beliefs are not absolute, that didn't necessarily mean a theist will become an atheist one day down the road or vice versa. Our notion of the subject matter at hand is susceptible to change as different thoughts reveal various other perspectives that one may find diserving of consideration. But either way, in the end of a discussion one might find him/her-self strengthening his/her initial position on the matter. I would still consider this a change in one's initial belief because his/her awareness has changed. And to me, that's relevant because in essence it affects the validity of a belief. And I would like to add once again that I in no way find one of the given beliefs to be invalid, agnostic included.
Moving on, I couldn't say whether I was born with the idea of God or not, but I can say I've always been attracted to the ideas of a higher consciousness. So, naturally I seek an understanding of God. Of course I don't limit myself to a thiest's perspective, a single religion, or other ideas that are philosophically similar/related. Needless to say, I throw atheism as well as science in that same boat. If by chance you ask why, it's because they are all subject matters that express thoughts that shed light onto the world we live in and the ideas that form our way of life and that give notion to the existence we're all a part of as one whole being composed of individual dynamics.
To me, the belief in God is a belief in a higher consciousness that is always a thought away. A force that is discovered by seeking wisdom. I find that the various religions and mythologies help us explore the nature of our existence and existence itself. I've always considered God to be life itself. Something we're all a part of individually. Something that is defined and limited by our notions of thought. A notion held true when the perceived force gives a constant and consistent result. If it doesn't, the flaw is in our initial notion, not the system we're a part of and attempt to define with understanding. A higher consciousness is reached only by genuine thought.
In the end, I've come to the conclusion that we live in an existence that's a constant growing perfection. How, you may ask. Well, the system is perfect, but we continue to perfect our understanding of it by exploring various perspectives and seeking a higher consciousness. The unknown always seems chaotic. Furthermore, one can impose or project that higher consciousness as a separate being/entity apart from oneself that an individual being discovers, relates to, defines, and worships as God (or other diety); such as typically associated with theists. Or, one can impose or project that consciousness as knowledge/wisdom/enlightenment that one seeks and defines through math and science; such as typically associtaed with atheists. Just to clarify, an individual, whether atheist or theist, isn't limited to just one of those typical behavior patterns that I just expressed above because each side is defined by his/her belief in God, and not by the way one explores that belief.
However, an agnostic explores both sides, but doesn't allow his/her beliefs to be defined by a single set of the traditional beliefs, even though he/she may lean towards one side of the arguement. It seems agnostics need to explore their own thoughts before they can decide on the existence of God.
On a side note, El Hombre Invisible, I don't know if you're aware of this or not, but a "concrete assumption" is an oxymoron since an assumption implies an unsure thought. And I think it's safe to say that a belief implies the same thing except with more assurance. Either way, you're still accepting a thought that draws a conclusion on the existence of God. Something you can't consider without the notion of God. A thought that gave you awareness of your initial beliefs. A belief you continued and strengthened after giving consideration to someone's thoughts about God. You've always believed God did not exist. Well, you used the words "concrete assumption". But anyhow, how would you know if you've never had your own notion of God to begin with?