I remember my cousin once said that he tried to believe in God but when he prayed for a car, and one didn't fall out the sky for him, he didn't believe anymore.
No, I am not making fun of anyone, I am trying to say that when someone believes, they don't use the fact that there are blind people, deaf people, autistic people, etc. to not believe in God. The reason that the author of the OP doesn't believe in God isn't clear, but I doubt it has anything to do with the fact that there are blind people- I am pretty sure it is much deeper than that. I have no reason to believe, I just believe. I would assume the same of other theists. And my guess would be that atheists don't have any reason to not believe, just that they don't believe- at least that's what most of them say. (I am not saying everyone doesn't have or no one does have a reason, but I believe that most don't by my observation)
My cousin, for example, didn't believe in God when he prayed for a car- of that I am certain.