I’m a 56 year-old woman who has been involved in some way, usually as an accompanist, with church choirs and secular choirs since I was a small child.
I agree with you that being in the church choir is a calling to lead the congregation in worship of God. (I’m not so sure about vocation, but that’s probably just semantics.) I certainly agree with your enthusiasm and desire to encourage your fellow singers.
But…one thing that I have learned over the years is that the DIRECTOR is totally and absolutely in charge of the choir. He/she is the one who should be imparting to the choir the purpose and vision of the choir. He/she is the one who “catechizes.”
It is not your job.
If and only if the director has asked you to teach (“give catechism”), then certainly, prepare pithy meditations and short talks that will hopefully inspire the choir to sing with all their hearts to the Lord.
But if the director has NOT asked you to teach, then don’t.
Here’s what you CAN do: always be an example of enthusiasm and concentration during the rehearsals.
During the breaks, and in the conversations before and after the choir, use your enthusiasm to try to impart a larger vision of “choir” to your fellow singers. However, I fear that some of the choir might ignore you, or even get irritated with you, because many people come to choir for social reasons, and wish to use that time before and after practice to talk with their friends about “non-choir” topics like family, work, school, sports, entertainment, politics, etc. You should respect this and not try to turn the non-practice times into “catechesis times.”
Again, you must follow the director’s lead and not try to be a “mini-director.” You might be OK with your current director and the two of you work well together, but I can absolutely guarantee that many choir directors will not tolerate a “second voice” and will censure you. And that is their right as director.
Have you considered starting your own choir in the parish? A smaller ensemble of the regular choir perhaps? Or perhaps a chant choir, a contemporary choir, or a “traditional praise” choir? We have several choirs in our parish that are not conducted by the Music Director, but by another parishioner. If you were directing a choir of your own, YOU would be able to catechize and impart to your singers the mindset that you already have. Of course, starting another choir in the parish must be done with the director’s permission and blessing. I’m not talking about starting a rogue choir!
I hope this is helpful to you. I’m not saying all this to discourage you.