I was a convert at 19/20 years old. So I would fit in your former group I guess .Being ignorant of what the Bible actually contained relished the" Paradise Lost" book simplistic as it was it gave me a foundation for accepting their beliefs ,then "Equipped For Every Good Work" that was a commentary on each book of the Bible convinced me they had the "truth" along with the green book "Your Will Be Done On Earth" dealing with Daniels prophecy which at the time did seem to fit in what was taking place in world affairs at that time.
The King of the North the USSR and the King of the South the Anglo American world Power..
Remember this was in the 1960`s when nations were exploding Nuclear bombs in the atomosphere ,both Atom and Hydrogen. such as the USA ,USSR ,UK ,and France in those early years .
Russia today is not to be confused with the USSR (United Socialist Soviet Republic ) as it was back then.
For young people who dont understand that I recommend watching the satirical movie Dr Strangelove its a classic yet identifies us oldies who lived through that era.
We now have far more nations that have Nuclear capabilities such as India ,Pakistan ,China ,possibly Israel .
Others that are working towards nuclear capabilities are North Korea ,Iran ,and these are a worry.
How many more are working towards it ? who knows but its a worry and its not going away.