Here's what I think you do. It's not easy, but it's what you need to do if you want your son intact.
You say no, I'm not going to allow our child to be cut. Then you tell your OB that you don't want circ, and you do not sign consent forms in the hospital. You tell the nurses, etc. that you refuse circ.
I think in terms of dealing with your DH, you still let him express his feelings, while holding your ground that you will not allow it to happen. Let him ask questions, etc. but you just keep saying no, over and over and over and over....... and its going to be up to you to be strong.
You need to take the power of that decision.
My first two sons are circed because I was not strong enough and didn't believe it strongly enough to go alone on the decision and make my way happen. Now with our 3rd, DH is onboard.
Also, focus on your goal. DH does not have to agree circ is bad. All he needs to accept is that your son will be just fine with all his parts, and it's OK to have a foreskin.
Good luck! Please feel free to PM if you want to chat.
(My husband just looked over my shoulder at the computer and then said "I still think you're wrong about it, but I'm willing to do what you want." We're having our 3rd son tomorrow! And he will be intact.
Your DH doesn't have to agree, he just needs to go along for the ride.)