I think that the French means that the only founding text and the only weapons young people have is their computer; it makes me think of missionary expeditions, although "bible" here may not necessarily mean the sacred texts, but something like "guiding book," a model.

swear by works with "bible" but not with "armes"

Or you could even use Bible, and I think that the sentence indicates that it is not to be taken literally
totally by chance, looking for inspiration, I found this sentence on the net:
The manual, which Chow prefers to call the "guiding book'' rather than the "bible'', describes Falun Dafa as a cultivation practice, a two-pronged approach to life. She says her "guiding book'' deals with...
http://www.clearwisdom.net/emh/articles/2001/3/11/5772.html

hope it helps

paola l m