No. They are paying you to provide your training and expertise. You're educated in this matter for a reason. It's not an opinion, it's necessary information for informed consent. It's also not unethical to have a position that you will not provide information to enable or encourage circumcision. As long as you refer them to someone or some place else that can provide the information they're asking for, you have every right as a professional to morally object to being a party to that. I provide all of my clients with factual information, informing them that routine circumcision is painful, risky, and medically unnecessary. If they ask my personal opinion I tell them I think it's a human rights violation. If they ask me where or when they should get it done, I tell them to talk to their pediatrician, and that is all I am willing to say.