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I love the fact that you put Battletech/Mechwarrior as two separate things. Anyways, the point is that you seem to have an issue with generalizing things, as well as a lack of creativity when it comes to the formation of religions.
Also, the reason you may have never heard them described like that in battle is because you've heard it from the perspective of ancient civilizations, to whom many modern technologies would look like magic, let alone nanotechnology.