Almost every doctrine of Jehovah's Witnesses and their evil empire is based on inference and conjecture of scripture. It is all pseudo-deduction.
"Jesus said, 'Go therefore and make disciples. Baptising them in the name of the father, and the son, and the holy spirit.' So, Jesus commands us to preach and, if you don't, he'll kill you for being disobediant at Armageddon." - Watchtower logic.
In over 3 decades of being a Witness, after literally thousands of hours spent in the "door-to-door ministry" I never once "made a disciple" and, unless you're an elder, you never baptize anyone. So, it was all for not according to scripture.
I'm now a devote aethist, but I still study scripture. At this point I can tell you this much: Just read what Jesus said in the 4 gospels. That is all christians can truly rely on. The "apostle" Paul was not a christian. Frankly, I'm buying into the conspiracy theory that Paul taught falls way short of what Jesus intended and he did it on purpose for a specific reason.