FWIW I don't think the only way to learn/use Gi/Chi is by reading Taoist or other Chinese religious works. I think it inclines the student to studying the religion more that the use of Gi.
In the Hapkido I studied, as part of our warm up, we worked on breathing exercises moving our arms, while concentrating on our Tanjon; the area about 3 fingers below our belly button. Worked for me without any change in my religious beliefs. Did I learn as fast, or as well? I can't say since I did not try the other as well. And I haven't tried blowing out candles through a wall from 20 feet away, or knocking opponents off their feet without physically touching them. I wouldn't say that is impossible, but I doubt people's ability to do so.