STEP ONE
Determine whether the attachment to Jehovah's Witnesses is an emotional one (social, fear of death, wanting to see dead loved ones,) or intellectual (disproving false religion, chronology, doctrine.)
If the attachment is EMOTIONAL--you can't do a damned thing until your wife gets a whiff of the skunk when what she needs is the sweet scen of Christian love.
If the attachment is INTELLECTUAL, this will be easy.
You stick with the most basic fundamental and foundational premise and do not waver.
FALSE PROPHETS have a test clearly indicated in scripture.
Ask her if she is willing to apply that test to the history of "Truth" teachings concerning 1874, 1914, 1925 and 1975.
If she is unwilling, she is intellectually dishonest and suffering cognitive dissonance. You won't have her ear or her heart.
Deu 18:20 But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die.
Deu 18:21 And if thou say in thine heart, How shall we know the word which the LORD hath not spoken?
Deu 18:22 When a prophet speaketh in the name of the LORD, if the thing follow not, nor come to pass, that is the thing which the LORD hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him.
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Who do the GB say they get their "Truth" from? JEHOVAH.
What is the name on their magazine and their religion? JEHOVAH.
When they send 7 million people out to say something in JEHOVAH'S name as JEHOVAH'S Witnesses---and the things they say are FALSE . . .what
else can you call it but prophesying in HIS NAME?
You can deal with an honest person but you can't deal with an emotional one.
Determine what is what and which is which.
In the meantime, the very best thing you can do is to demonstrate the BENEFIT of freedom of thought and the HAPPINESS of not being constrained
by a cult.
If your wife has no emotional alternative why would she change her mind?
YOU CANT TAKE THE MOST IMPORTANT EMOTIONAL SUPPORT from a person and give them a "black hole" as an alternative.
JW's are told the ONLY ALTERNATIVE is this "wicked" "dying" system of things which is "perishing".
Show her an honest alternative with genuine, generous, charitable and loving people who are REAL and you are half-way there.