Then quite a lot of the scientists doing the science would not exist.
Interesting article, even though I have to take issue with the line "it seems easy to decide not to believe in God"; you don't decide what you believe.
I can accept that superstition is ingrained in us as a species (and not just us, see B. F. Skinner's famous experiments). I can even understand the attraction of faith in a higher power. Atheism though is not about what your subconscious may be telling you, it's about what your reason is telling you.
For some time I've thought that aesthetic sense has a lot to do with what path we take, religiously speaking. I am an atheist partly because I like the idea that the universe made us without a single conscious thought. It is incredibly simple, and I find simplicity beautiful. But I can also appreciate that there are others who find that thought hideous, and for some reason prefer the thought of an anthropomorphous creator being who exists for unknown reasons and created us for his own purposes.
Maybe choice of religion or no religion comes down to what you're comfortable with. I have no problem with that, as long as people are free to choose.