Be patient. Introduce the music that you want to be sung in small increments instead of all at once. Make sure your pastor understands that it's not possible to immediately from Glory and Praise repertoire to chanted Latin propers without completely alienating the people. Bear with a little bit of flack for now for the sake of pastoral needs.

My pastor always says to select music that helps people pray. See if you can gradually get them to the point where they DO pray through listening to chant. A little bit at a time...

I wouldn't blast them with Latin all at once. Start with some English chant, a small amount of Latin, and some anthems that they like. Perhaps some hymn-based anthems would be good. Changing this group will be a multi-year project.

I'm in the middle of a multi-year project myself. 2 years into it, and we still use the piano, still use some carefully-selected hymns/songs from the Gather hymnal.

We also have done a few pieces of Latin polyphony, learned the ICEL chants of the Mass ordinary (though we don't use them as often as I would like...), sung from the Simple English Propers, sung from Rice's Simple Choral Gradual, increased the size of the choir by close to 50%, and learned a lot about how to sing for the liturgy!

It will not be done overnight, but we are moving in the right direction--inching forward in God's kingdom, if you will.

Sounds like a ten-year project to me. Are you there for the long-haul? Because if you are, Liam's right. Pastors come and go, (Just like the military. Hurry up and wait.) but the parish is always there. If I based our entire repetoire on what the current pastor preferred, we would be doing about-faces every couple of years. That could get rather expensive...

Methinks serious baby steps are in order here.

But for now, have you thought about having a choir retreat? You could invite someone knowledgable and in line with church teaching to give it. Ask the choir to come armed with questions. Have the Eucharist and humility your focus.

Thanks, Paix. I was wondering what "liberal music" is...

Thanks for the advice. I have done things slowly, but even so, the Simple English Propers and organ music have been met (by some, not all) as alien and unfriendly. I do have a children's choir that have taken chant and embraced it. The parents are thrilled and the people in the parish think it's "cute for the children", but not something for the adults. I haven't gone totally chant nor organ. I still use the piano and use some of the music the congregation likes and can sing, along with good chant and organ. But, this congregation is going to need a lot of time and patience. Our priest has also introduced new services, i.e., Corpus Christi procession, formal Stations of the Cross, Divine Mercy prayer service, morning and evening prayer. There are some people who come on a regular basis, but others who feel he is "taking a step backwards". Our former director was a VERY charismatic director and our masses were full of Praise and Worship music with guitars, drums, flutes, etc. The organ was never used and gathered dust. When I took over and began some of the organ music, without deleting guitars at that point, the entire musician section left for another parish, without giving the organ music even a chance. They continue to lash out at our new pastor and me as music director and have used forums such as Facebook to get their message across. Our Deacon and our DRE also do not like the new pastor and have blamed me for a lot of things. But, as you say, time is on my side and I need to be patient. Thank you again for all the advice.

I will admit I have the pastor's total support. We work very well together. One of the major problems I am having is that I was director prior to his taking the pastorship, and prior to that was pianist for several years under a very difficult, opinionated director, who never gave me any credit and belittled me a lot. The former pastor never took my concerns seriously, so when the new pastor came in, everybody automatically assumed I would be against him and "go with the flow". In any case, he and I have a wonderful working relationship and he is dealing with his own difficulties with the parish right now. This parish is not open to change. In their minds, everything should always stay status quo. They had a lot of difficulty accepting the new mass translations, let alone any chant or organ hymns. Like some of you said, it will just take time. The children are like little sponges and work well with me (they've been my students for several years).
Thanks again for all the advice.

Musicteacher56 - I agree with a previous poster. Sometimes it's necessary to weed out the folks who have a different idea of how things ought to go. In your situation, they have exited and you now have an amazing opportunity to build as you like/need. I like the old adage, "ending are sad and beginnings are scarey" - but I'd add that beginnings often create rare opportunites. With patience, you'll triumph. A great benefit you have is your pastor's support. Persevere!