“However, sometimes we simply need to speak up in protest.”
But you are not speaking up to the assembly that elected him. You are speaking to the flock that has been entrusted to you. Speak to them positively as a good shepherd. Give them good food and let them draw the godly conclusions. If you rail against the powers that be, for the most part, it will be a one issue sermon and if the news gets wind of it it will be reported as an anti-homosexual rant.
worth considering
it is, nonetheless, good to review the reasons the decision is wrong-headed