Your reaction to his response was perfectly appropriate. I showed the girl I loved proof that the religion made false end of the world predictions. Something that every witness would mock "Babylon the great" for doing claiming that it was proof that they were false, yet when they, the witnesses do it, it's merely a mistake. She said it was just a mistake on their part (imperfect men excuse)... I was speechless. Someone I thought was very rational and logical had just said the most illogical thing I had ever heard.
The witnesses are a cult, it's simple as that. The people who follow the organization have been brainwashed to never question the organization. If they do, they have the fear of being removed from the religion that they deem to be true. Being removed, in turn, sentences you to death when Armageddon comes. Do you see the circle of fear-mongering that they have created? This is why most won't question, even though their inner logic tells them otherwise.
Ultimately you have 3 options. 1/ FIGHT, do tons of research on the organization and try to wake your husband up. 2/ LEAVE and move on with your life. And lastly, 3/ ACCEPT your husband's and his family's beliefs at the cost of your mental health.
I wish you the best on this rough journey and look forward to your next post.