You can't see air, yet you breathe it and it sustains your life. You can't see gravity, but jump off a building and you'll find out just how real it is. Germs are too small to see with the naked eye, but get one and it will make you sick. Magnetism is an invisible force, but it attracts and repels whether we see it or not.OK you troglodyte, here is the difference between the list of things we can't see and god: we can actually observe the effects of gravity directly, we can observe the force of magnetism directly, we know what air is and can observe it, and we can see germs. Anyone with a third grade science education that wasn't given in a Christian school would be able to tell you that. Just so there is no misunderstanding, let me direct you to the Wikipedia entries on air, germs, magnetism, and gravity.
Personally, I have never known anyone who has denied the existence of things such as air, gravity, germs and magnetism. Yet I have known plenty of people who have denied the existence of God. The reason they deny his existence? Because they cannot see him.
Do you know why you have never met anyone who denied the existence of air, etc? Because we have proof of such things existing. They actually do have a measurable effect on the physical world. What about God? Anything? Can anyone give me any kind of proof that doesn't amount to a feeling they get or some grand delusion that is all in their head? I'll be waiting, but I won't hold my breath.
Atheists are not a group of babies who have yet to develop object permanence. We understand that on a cloudy day that the sun is still there just as we understand that the air we breath is real and the force of gravity is real. I wonder if Parrish Myers would lock himself in a closet somewhere, would anyone believe he still existed? Let's give that experiment a shot.