Baloney JW mythology!
The very concept of “captivity to Babylonish religion” is cult talk. It depends on further modern myths such as the existence of such a thing as “True religion” which idea is not based on any reality just a religious imagination. None of this sort of talk goes beyond the closed loop of cultism, it makes no sense to outsiders but to know what these terms mean is to JWs, a badge of membership.
However...................... if the idea that there was such a thing as true religion free from any influence of worldly or “Babylonish” beliefs and practices, then JWs would still not qualify in 1919 or ever.
The fundamental teachings of the Bible are fully based on astrological stories and the mnemonics for transmitting them down through the generations in pre-literate times.
Quintessentially it centres on the Sun god, his own male offspring born of a virgin at the third day of midwinter, sacrificed at the spring equinox and returned to his heavenly father in shining glory. At its root it is nothing more or less than the annual story of the Sun dressed up in mythical narrative.
It is impossible to use the Bible as the basis for religious belief without reference to these folk tales whether from Babylon or elsewhere. There is very little material left in the scriptures if you peel away the pagan input.