Wish I could be more encouraging,,I was submissive 10 yrs., arguments sure don't work, not my nature anyway. But the marriage eventually ended. He married a couple months later to a non-JW. She divorced him about a yr & half later, she didn't like JW stuff either. Funny.
However, now, when it comes to your children, it's different. You have every right to speak with them, no less than their father does. Don't let JWs say 'you' can't pray with your children. You can say little stuff to your children, like okay to pray saying "Father." Jesus taught so in model prayer. Teaching them, keep it simple. And the children will get it. JWs go into so much meaningless explanations, loses the kids anyway to understand.
Stepping stone, about birthdays, take them for 'their" special day. Let them pick a movie of their choice, and a restruant of their choice. Give a little special story of their birth. Give them a toy or two,,they won't be called "birthday" presents but gifts for their special day. JWs create their own little language, you will have to do so also. Opening their minds to additional thoughts and choices, little things. As the WTS, tries to close up their minds, you must discreetly teach them to open theirs, while yet teaching them to still respect their dad. JWs believe this way or that, BUT many others believe another way or two, and then try to encourage acceptance for other people to have okay choices.
Well, it a one day at a time thing. You won't be able to change your husband. But you can be successful for your children to grow and not get entrapped into the JW non-thinking mind.