OMG - This was my DH! Right up until I was in labour and even during labour...."you know you can have an epi and it'll be better" was his words.
I stuck to my guns and the whole time in my head kept telling myself I could do this and prove him wrong. I also had my mum there who kept reassuring him that I was going to be fine and that my body was made to do this.
A few days later I thanked him for being "supportive" even though I knew in his mind i was doing the wrong thing. All through my labour I could hear him saying your doing great and even though he didn't like my decision, hearing those words coming out of his mouth (whether he meant it or not at the time) helped me keep going. Even now he'll say he didn't think I could do it but afterwards was proud of me for doing it.

Stick to your guns, reassure him, have you got friends with kids who had natural births? Maybe get them to reassure him too??? Do the research and calm birth classes etc that might help too!
Can you have a doula or someone else there also to support the both of you???
HTH xx