atheism"; no need to apologize.
But, why do you instantly cease to believe?
It's not that I cease, it's that I don't start. I don't know what color mars is if you dig down 20 miles into the crust. It could be green. I don't have a reason to believe that it's green, so I currently lack belief that it is green. Nothing ever made me
stop believing--rather, nothing made me
start. This goes even moreso for something like a supernatural deity, which has much less of a basis in the phenomenal reality that I have had than the possibility of green Martian rocks.
What happens if you go blind? Do you stop believing in the world? What if you lose all of your senses, do you stop believing there is a God. And the arguement that isnt good is, "Well if I lose my senses, then I can still remember there was a world", because how do you know that millions of years ago you werent with God, but now you have forgotten. You cant remember what you did at 2:30 yesterday, or what you ate this same day 5 weeks ago. Memory isnt reliable with this arguement.
At the moment I have a large number of very good reasons to believe that the world exists, which I have never been able to say for god. Ergo my belief in one but lack of belief in the other. Remember, it's just a lack of belief, not an active denial. I'm an atheist, but I'm not wrong if there is a god, because I've never said that there isn't. I've said that there is currently no logical/ empirical reason that I can see to hold belief in gods.
The point is, why do you rely on your senses for that which is thought to be above senses. If you say God is almighty, why do you try to find evidence of him with your limited senses, mind, intellect, and memory?
I don't like to break out the invisible pink unicorn example because it can be offensive to theists, comparing their beliefs to absurd fantasies. As such I will preface this by saying that some of the most intelligent people I know believe in one supernatural notion of god or another, and I by no means want to disparage theism.
Quite simply, if I propose the existence of an invisible pink unicorn (which is not just invisible to sight--as you have proposed of god, I'll say that the unicorn doesn't register on
any of the human senses), there is no reason to believe in such a thing. Yes, it's hypothetically possible. Yes, finding evidence of this unicorn with my limited senses, mind, intellect, or memory is contrary to the very notion of the unicorn.
No, the fact that I have proposed such a thing does not give you a logical reason to hold the belief that it actually exists.