Something doesn't have to be proven in order to be believed. It is compltely possible that a God does exist, but it's highly impropable that our existence is the result of a God. Your talking astronimically impropable.
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The problem with that is you are trying to say as tho God were merely mortal. Hes not, hes completely divine, hes well, God. Here is my reason as to why its stupid to not believe in God:
Say there truly is NO God, and, like you, you believe so. You live your life as anybody else would, except that when you near your death bed, you begin to slightly panic as you realize that the end is near. You die, and thats it, you fall into that eternal sleep.
Now, same as above there is NO God, but you have someone that DOES believe in God, they live their life as anybody else, but when they near their death bed they can rejoice as they know that the end isn't near, the beginning of a wonderful new life is. The time comes and they fall into that eternal sleep, nothing happens, BUT they died fulfilled. Its not like the second they die they say "o crap, there really is no God". So therefore the believer wins that scenario.
Ok now heres this one : Say there IS a God, and like you don't believe so, you go on about your life saying how silly God is. You lay on your deathbed knowing that the end is here, but when you fall into that deep sleep you find yourself at heavens gate tho you are denied entry based on your lack of faith(not your undenying worship) but the fact that you refused to believe.
So now that leaves the one that DOES believe in God, again, they go about living their life. They reach their deathbed and die smiling because, as i said, they know the beginning of a new life is upon them. They fall into that sleep and arrive at the gates of heaven to start their blissful new life.
So that makes it faithfuls 2, atheist 0.
I mean do you see that? Its not silly for someone to believe in God or a life after death at all.