I used to wonder (and believe I even asked you) if an aging agnostic would eventually ask, “is this all there is?”
The answers to that question could be mind-blowing.

You probably mean atheist and the fact is that most atheists die quite contentedly without ever asking that question. It comes from giving thought to life and belief and faith and knowledge and thinking is a pretty good thing.
I am agnostic however many people, you apparently are among them, who think that agnosticism is a belief or a faith. It is simply the acknowledgement that metaphysical notions are not known. If a genie appeared and offered to give me one wish it would be that everyone in the world become agnostic; there would be agnostic Catholics, agnostic atheists, agnostic Jews, agnostic Muslims, etc. Everyone would retain their belief/faith and they would freely tell others if they wished, spread the word like the Mormons do, but they would understand the difference between belief and knowledge. I like to think that if everyone understood that their belief was not any better or worse than any other belief and that we should be respectful of others’ beliefs the world would be a safer and happier place.

What do I believe? I believe that this life is wonderful. I like to make an analogy that fits well into the Christmas season. I like to think of life as a gift and I know that if I gave someone a gift that was unwrapped and the recipient exclaimed “great gift, Thank you! What else did you get me?” I would think that person was an ingrate. Just in case the analogy escapes you I’ll put it in terms of your belief. God gave you life and you are saying “is this all there is?” I think this life is wonderful and I give thanks for it frequently. I’m not looking forward to something else. If this is it, thank you! If there is more, wow! But my job in this life is to live it fully, to use the gift well and with appreciation.

What I believe

There is a type of question on tests in which we are given several samples and we are to choose which one doesn’t belong. For example, which of the following doesn’t belong: horse, mouse, man, mosquito, whale? The answer is mosquito because the rest are mammals. Here is another. Which of the following doesn’t belong: Muslim, Jew, Sikh, Agnostic, Atheist, Christian? Five of these hold a belief about the existence of God. It could be said that an agnostic has a belief but the belief is not in the existence of God but rather that no one knows whether or not God exists. Atheists believe there is no God while the others believe there is a God.
It bothers me that the term agnostic is frequently used similarly to the other terms in the list, usually lumped together with atheists as being nonbelievers (in a god). There can be agnostic Christians, agnostic Sikhs, agnostic Muslims, agnostic Jews and agnostic atheists. That is to say that, linguistically at least; one can hold any belief about a god while acknowledging that what they believe is just that, their belief.
But when someone says their God is the only true God, that their God is the only way to the Promised Land, and that they know this, they are telling everyone who doesn’t hold the same belief that they are wrong. Most of us do not react too well to being told we are wrong. How much better it would be if that someone said something like: “I believe in this wonderful God and through Him I will find my way to the Promised Land. What do you believe?” Then I could respond, “I believe in 24 Gods, two for each sign of the zodiac and they are all trying to sing in harmony and when they do they will hit a note that will transport all of us to the Promised Land.”
Well, hey, there’s a cool belief.
What I truly believe is that the world would be a much better place if we accepted each other’s beliefs as being no less valid than our own.