Vladimir-
I must say you are being a bit vague about your position and what you do. Please explain- is the music you participate in, protestant? Was it written by Protestants, for Protestants? Please disregard, at this point, whether it is inimical to the faith.
If the answer is yes, you must stop playing. You are, thusly, participating, and therefore indirectly condoning, the way in which protestants worship, which is wrong.
You mentioned being a part of a band in the past? Perhaps you know then, how detached a musician can be when practicing his art. It isn't a wonder that so many Protestants and atheists are organists at Catholic churches and never convert - they perform their jobs with the utmost perfection, but yet simultaneously with almost mechanical detachment. Many musicians can retreat into something like a state of interior contemplation when playing music.
Yes, Vladimir, I know the feeling that one gets when involved with music. But this is
exactly why we must not worship with modern types of music which protestants use. Prayer, and worship, are not from the carnal. Prayer is a higher part of man that is his 'feelings'. We should worship our Lord when we have the joys of belief, and when we feel dry. As someone had mentioned here before, the Protestant way of worshiping is "dummied down"; it is. If these Protestants, or Catholics even, are unable to worship our lord because the church rejects they way THEY want to worship, not considering how God wants to be worship, so be it. I'm sorry I'm not eloquent with words, and hope I'm getting my point across.
There's a reason we use Gregorian Chant in the Roman Church. Trust me, it would not have been hard to bring in some other instruments for the liturgy. I'm not sure what type of music you're playing at this protestant church, but I can not see how you can justify it.