Happy Blessed Free, you have been given here some good reasons for things to reply to your husband's arguments but I would like to suggest another approach which might be worth considering.
All Jehovah's Witnesses have been radicalised. Their beliefs ARE their life.
That means that logic is not their guiding force and however rational you are in answering criticisms, the mind of a radicalised person has been immunised against reason and the meaning of evidence.
A radicalised person has decided that whatever the cost or consequences of their belief, as a matter of personal pride and achievement, they are sticking with it. They are hoping for the future benefits of their belief and will only look for confirmation in the words of the governing body and the apparently united beliefs and conduct of their fellow Witnesses.
What is the antidote? Wouldn't we all like to know!-- but understanding why a person is leaning on whimsical beliefs as a substitute for a normal evidence based world view is a start.
The average-- but by no means all JWs-- are humble people with poor education and little of the worlds wealth and means. This is of course the ideal follower mentality cultivated by the GB.
SO, these things might work
1 Get to know why his life is so emotionally or psychologically precarious that he resorts to JW fantasy teachings. For example, a fear of death is often an unspoken motive for religious belief.
2 Demonstrate by your own considerate and thoughtful dealings with him so that he will recognise in time that he has a precious partner worth listening to and that the JW promises are not as good as his marriage.
In other words refuting a wrong belief is not necessarily the way forward with a radicalised fundamentalist. To contradict their viewpoint is like telling them that their whole life is a waste of time.