Absolutely agree with Tobily and previous posters. Even if you manage to convince him on this one, in the back of your mind the trust will be broken and you'll probably just start wondering what's the next battle you're going to have to fight him on. No point having an ob that you don't trust. When you're in labour, trust is vital.

My ob was very low intervention - so they do exist! He reassured me that no, he wouldn't be giving me a caesarean unless the baby was in danger, that I could labour hanging from the ceiling if I wanted to (then when I freaked and went from no, no drugs to I'm scared witless at 39 weeks he reassured me again and said that being scared is no reason not to have a baby and we would manage the pain - either naturally or with drugs). Then when I was scared he would want to induce me because my waters had broken, he reassured me AGAIN telling me that he HATED inducing women and would only do so as a very last resort. So by the time I did go into labour, I trusted myself to make good decisions and trusted him to respect and understand those decisions.

So I think if you're hearing warning bells, find someone else that you're comfortable with.