There are so many myths and misconceptions in both camps, Jehovah's Witnesses and Christian churches. I grit my teeth when I hear a JW speaker blather on about the "corrupt practices" in other churches.
Then BOTH groups are directed "not even eat" with such a one. Christians are afraid to invite them in for fear they are entertaining apostate ideas. And vice versa.
- I think the first step is to quit demonizing the WTBTS. Actually make them out as less scary than we have painted them.
- Then, make sure the Christian has a solid grounding in their own doctrine. Do they know WHY they believe in the trinity? Could they defend it?
- Finally, emphasize Christian love rather than doctrinal arguments. The most successful conversions away from the WTBTS I have seen, was not over doctrine, but genuine love and care. ....and ANY Christian can do that!