Look my experience with JW is NOT TO ENGAGE THEM IN ANY DISCUSSION WHAT SO EVER.To do so is to encourage them to keep coming back.Take nothing from them,don't let them in and refuse point blank to even tell them your religious beliefs.To do so is an invite to engage you in a dialogue.You cannot change their minds,they are relentless so you have to give them no lever to invade your life.
Just like door to door salesmen.
Incog.