In one respect, your husband is completely wrong, and that is in thinking that the right time to discuss this is when a child is already in the picture.
If you were married in the Catholic Church, you both already agreed to raise the children Catholic. If he said that at the time with no intention of following through, you may have grounds for annulment. I’m not saying you should pull out the big guns on this, but you should know that this is a big deal. He doesn’t have the option to stand in your way in terms of raising your children Catholic, including bringing them to the Sacraments. He’d be within his rights to introduce them to his faith as well, but not to actively compete or interfere with what you are called to do for them by your faith.
My husband and I are having trouble with this too. Shortly after our daughter was born, he confessed to me that he wasn’t really Catholic, although he’d “converted” shortly before we married. Yeah, he tried, he wanted to be, but he never really bought it, never could internalize it. Believe me, that’s a bad time to discuss matters, after the baby is born. We found a way to work it out, and it kind of sucks for him because the only acceptable compromise for me involved him still coming to church on Sundays (so I don’t have to take care of the child alone), not saying anything to confuse her until she’s of the age of reason, and to support what I’m still obligated to do in terms of living my life as a Catholic woman and mother (like practicing NFP, being open to more children, and teaching kids the Catholic faith–even if I’m now the only one who will do that teaching).
But I still pray that someday he’ll come to love God too and want to do all that I have to push him to do, and to do even more. Pray for your husband. Try to understand what is important to him. But then stand firm in what you believe and insist, if you have to, that he honor the promises he made when he married you (and don’t forget what you signed up for too, which is him, as a JW, and everything else that he is). If he refuses, you’ll be glad to know that before you have a newborn, stretch marks, and post-partum depression.
God bless. I’ll say a prayer for your situation. Please pray for mine as well.