Being true to your own vision might seem like a selfish approach, but in doing so, you established a sucessful working relatonship with your peers and the congregaton.
This new minister seems to be determined to impose his own will on all involved. I suggest this is a far more selfich approach to the situation.
I'm not a religious man, but I understand the importance of setting ego aside in favour of the music. Perhaps this fellow should have learned a bit of humility along with the theory.