""Nothing I have seen or experienced in my liife proves to me that there can possibly be a God""
Well, I would go further than that myself: I would say that nothing I have seen or experienced in my life has ever suggested to me the slightest possibility that there can be a god. I guess I am as unshakeable in my faiths as you are... for the time being.
"Science couldn't prove it one way to you, and it couldn't prove it the other way to me."
Well, that's your choice... but from the little I know of science, the world can be more than adequately explained by natural processes than by the influence of a divine being. That is my belief, and there's not much I can see that is likely to change it... but obviously if someone came up with a theory more plausible than science involving a god, then I would have to accept it.
"So I understand (I think)"
Good! I've almost worn out this keyboard...