Understanding Jehovah’s Witnesses and their beliefs will help you share the Gospel. However, remember that knowing what the Bible teaches is very important. For example, when the US government trains people to identify counterfeit bills, one would assume they study counterfeit bills. They don’t; they learn US currency, and by knowing the real thing in detail, they can spot a counterfeit when they see it.
Helping Christians Share the Gospel of our Savior Jesus Christ with Jehovah's Witnesses