Quoting Due w/ a little boy!:" Your child is breech? I know it's risky to have a baby vaginally if your baby is breech and couldn't ... [snip!] ... a girl younger then me by about a year whose due 2 weeks before me said it's impossible to refuse a C-section to a breech baby."
You can refuse, yes. However, they have the option of not having you as a patient anymore, and anything that happens after that refusal is on you, and sometimes not covered by insurance since you're going against medical advice. Also, while some people (mostly midwives) are trained to deliver breech babies, I don't think I'd ever allow let alone force a Dr who was both uncomfortable and untrained to do it, you know? I mean, if I had a Dr who was comfortable with it? Sure, but the odds of a problem would be higher with someone who didn't want to do that and was very unsure of themselves.
I'd maybe find a Dr and hospital (or midwife) who agrees with your views first.