You cannot educate children that life has no meaning, no value, and be surprised when they act on that education.
Agnosticism, as it pertains to theism (and my interest here is Christian theism), runs one of two ways: 1) the individualist way—claiming to have no personal knowledge as to whether or not God, (or god, or gods, deity, etc.) exists. Others may make such a knowledge claim, but the individual agnostic claims, at least for himself, to have no knowledge; 2) the second way agnosticism is expressed is universality, stating that knowledge claims about deity is impossible for anyone. No one can know if such a thing as deity exists, and those who claim to know are either simply wrong, deceived, or deceptive.
“To make our conversation more interesting, let’s start by comparing notes on our past. That will fit in well with our plan, for the debate concerning heredity and environment is prominent in our day. Perhaps you think that the only real reason I have for believing in God is the fact that I was taught to do so in my early days. Of course I don’t think that is really so. I don’t deny that I was taught to believe in God when I was a child, but I do affirm that since I have grown up I have heard a pretty full statement of the argument against belief in God. And it is after having heard that argument that I am more than ever ready to believe in God. Now, in fact, I feel that the whole of history and civilization would be unintelligible to me if it were not for my belief in God. So true is this, that I propose to argue that unless God is back of everything, you cannot find meaning in anything. I cannot even argue for belief in Him, without already having taken Him for granted. And similarly I contend that you cannot argue against belief in Him unless you also first take Him for granted. Arguing about God’s existence, I hold, is like arguing about air. You may affirm that air exists, and I that it does not. But as we debate the point, we are both breathing air all the time. Or to use another illustration, God is like the emplacement on which must stand the very guns that are supposed to shoot Him out of existence. However if, after hearing my story briefly, you still think it is all a matter of heredity and environment, I shall not disagree too violently. My whole point will be that there is perfect harmony between my belief as a child and my belief as a man, simply because God is Himself the environment by which my early life was directed and my later life made intelligible to myself.”