It sounds like they *the church administration* need to give you a job description and tell you exactly what they want you to do. What it sounds like to me is your Pastor needs to come to a choir rehearsal and set the house back in order. If YOU are in charge, then those who are opposed to you running the show need to hit the door... If you are NOT in charge and someone else is, then you need to follow.
If your church needs you to be the Minister of Music then your Pastor needs to come and set the record straight. If they need you to be the musician and only play then do that.
If they don't want to learn new songs and your Pastor is alright with that then do the same old same old.
If he doesn't want to hear the same old songs every Sunday then HE needs to go to a rehearsal and tell the choir what HE wants.
I'm a lead, follow or get out of the way kind of fellow. It sounds like you have some folks who think they can do better than you can. Give them the opportunity. Let them walk in your shoes for a few weeks. I'm sure they'll come out of this with a lot more appreciation for what you do.
You know as well as I do that the general public just thinks "all we do is just sit there and play" anyway...
If your Pastor won't stand up and clear the air then NOTHING will change.
MrSparrow