You keep jumping to the conclusion that this is some sort of "right to personal opinion" issue. It isn't.
It is rather an issue of the RESPONSIBILITIES of an elected official. I expect my elected officials to behave in a certain way regardless of their personal opinion.
When a liberal governor (like Mario Cuomo of NY state a few years ago) commutes to life the sentences of any and all convicted murderers who have been sentenced to death, based on their PERSONAL conviction that the death penalty is wrong, then I OBJECT. He has no right to impute his own personal beliefs in such a situation. He has no right to use his personal opinion to make such a decision, because he is an ELECTED OFFICIAL and must act in accordance with his office.
When a judge practices judicial activism, seeing things in the constitution that aren't there but are instead simply in accordance with his personal agenda THAT IS WRONG AND I OBJECT.
And when (and if) a legislator walks out in the middle of a prayer by a Muslim cleric because "that God isn't my God," then I OBJECT, because it is wrong for him or her to act on personal belief when they stand in their elected office.
It's just wrong, period, no matter if you're talking about an atheist "dissing" Christianity or what have you. It's wrong.