Keep in mind that this is a 19th century concept and that concept and it's attending culture continues to this day. Everything that permeates the Kingdom Hall is part and parcel of the 19th century even the educational level, treatment of women and all of the huge mistakes about medical advancements. Their knowledge of the bible comes from uneducated people born in that century.
At this point in time the average JW is so infected with that old time religion they believe their corporate culture like no beards or no pants for women are beliefs.
It's most glaring in the 32 reasons that you can be DF for when the bible only mentions a few things. Like a few other religions they cherish their delusions. Why else would a group like the JW's finish so poorly by every social metric then every other religion in the Pew survey?