I have written this before, or on somewhat similar case. I am not able to pin point it now.
I am writing as a reminder to myself, as well as making a clearer judgment.
The paradox of servitude and volunteerism must be dealt with, for they are not the same thing. When one is called by God, one's willingness to submit to God, is thus, servitude, not volunteering: It is of God's command. Servitude is not enslavement: It has no tyranny involved. Volunteerism, favored by many churches (because they do not preach), is of self. As soon as one calls it God's will, I will promote this label of volunteerism to servitude in the Lord and thus, the "volunteer" must adhere and submit to all Christian principles. For such is all workers of God. And should it be claimed, "but the state of the "volunteer" is not mature enough a Christian, even to be a Christian", then the ones who bring this "volunteer" in, is in greater offense than the "volunteer", for these have the responsibility to cause the "little one" of God to stumble.
So, my responses to the misuse or abuse of such paradox, would be as easy as "Do I have a choice?", "I have better things to do".
As for the youth Sunday school, the whole of the responsibility as well as the whole of the welfare of the youth at church, is not mine at all in any instance whatsoever, it is not possible even if I wanted it to. Because first, I did not "volunteer" for this, though I would do my best in God's grace as I have been commanded or asked of the church, secondly, the schedule given me is neither fixed nor frequent.
Since it is now called "volunteering", I have blocked any "request" of the church for any other types of committee related servitudes. Simply put, "clean up your own mess". Light can have no fellowship with darkness. I can only pray for them.