No, this has been standard usage since at least as far back as the High Middle Ages.

It is a usage of the same original word that has clearly diverged such that to substitute the intended meaning across contexts is most decidedly equivocation. "Faith" as in a kind of belief is not the same meaning as "faithful" as in not fucking other people. This should be obvious. The origin of the (nearly euphemistic) usage of the term is beside the point.