I was elected to the Kenai Peninsula Borough Assembly in 1989 and bit my tongue through invocations at each meeting.  I chose my battles, and ending the invocations wasn't one I chose.  But I did mention to Jim Skogstad, the Assembly Pres at the time, that all our "chaplains" were white men, mostly older.  Jim arranged for somewhat broader participation after that, including--gasp!--a woman providing the invocation.  

Meanwhile, over at Soldotna (public) Hi School, the graduation ceremony was verrrrry Christian and, on the eve of the first gulf war (Geo H.W. Bush's) our vice principal, over the all-school intercom, urged us all to pray.  The central peninsula is very Christian, very Republican.  The line between church and state is not always bright there.  Stay in line and you'll do fine.  Express any kind of dissent or difference, and the majority will let you know you're not one of them.