I'm sorry for perpetuating this hypocritically but I'm actually enjoying writing all this down now.
No, that argument isn't different from religion. It's intended to be a statement about how easy it is to create a god simply by claiming that whilst you can't detect the god, it's there. My response is, so? That's true. It doesn't disprove God, it doesn't prove God, it just proves that people can invent a god, which I'm pretty sure we all knew anyway. I suppose it's supposed to get you thinking, but it doesn't really add to the discussion in any more meaningful a way than someone saying "well, God might exist and you can't disprove that". Because its point (that people can invent a god) is completely obvious to anyone who thinks about it and, get this, religion still exists. People still believe, and trotting out the invisible pink unicorn isn't going to change squat. Belief makes the god, you see. Certainly people's beliefs could be wrong, could be invented without them knowing but since it's impossible to prove it doesn't matter whilst they're still alive and might not even matter after they're dead.
So what's the point of pointing out that people can make stuff up? Did you know that the north is to the north? Or that breathing is a thing that happens? And if you do, what good would it do to explain that to you using a metaphor?