When I think of the voices that have come out of the church, I just don’t know what popular music would be without them! But I do understand that what you want is gospel music.
You can do vocal performance and music education, and get certified for teaching K-12 music ed. That way, assuming that you live in a state that pays teachers decently, you can be a choir teacher in a public school with decent pay, benefits, and pension, although you may have to move to an area of the country that pays teachers decently. And you can do Christian music work for pay on the weekends, and possibly weeknights, and at Christian summer programs. And if being a gospel music artist pans out for you, you might be able to focus on that and make your living in it.
You’re a senior - what has happened with college applications for you? It’s a bit late in the game to be considering this, but I have a feeling that you might have been able to get a scholarship to a school that had vocal performance and music education.
With this in mind, are you going to the right school? I usually advise people that a reasonable guideline is that they can borrow the equivalent of what they might make in their first year in their profession. So an engineer? 80-100K total. A teacher? 60K total. A social worker? 40K total.
In your case, you have no way of knowing whether you’ll even be able to make 20K a year working church gigs and teaching music in Sunday schools. I could certainly see your parents feeling that it is not a good value to pay 100K or more for a degree that might lead only to piecemeal, no benefits, cobbled together jobs that earn you so little.
But depending upon your talent, your “stats” from high school, and whether you can combine it with a music ed degree (if you like the idea of teaching vocal music in a public school in a state that pays teachers well), you might be able to get a scholarship so that you could get out of school owing no more than a teacher’s first year salary, maybe even less. For instance, a school like BYU has very strong music and music ed programs, is cheap, and although it is Mormon, it is similar enough superficially in atmosphere to non-Mormon Conservative Christianity that you might be very comfortable there. Strong stats could get you major merit money at a place like U Hartford’s Hartt school, which has excellent music ed plus vocal performance, and is in CT where teachers make decent salaries. Many Christian colleges have strong music ed and vocal performance, because music as part of church worship is so important to them. Most states will have an in-state option for music education and vocal performance.
If you have no possible option on the table where you could major in what you want to, without your parents’ financial support, then it might be that you need to take a gap year and reapply to schools where you can get a vocal performance major very inexpensively, without relying upon your parents for financial support.
I can see where they’re coming from. There are families that would support a child for a music performance major, or theater major, or musical theater major, even when it is extremely unlikely that it will lead to well-paying employment. But there are many who won’t, who insist that college is also about becoming equipped to support oneself (and possibly a family) financially. You have to understand that from the day you were born, your parents have most likely been concerned about your future, how you will take care of yourself, because one day they won’t be there to support you. This is the reality of being a parent.
Personally, I think that you cannot force yourself to study something you dislike, just so that you can then earn a living doing something you dislike. If vocal performance and church music are your one true love, you have to pursue it. But you’re going to have to figure out a way to do that very inexpensively, and possibly without parental support - so that means some combination of major merit money, a very inexpensive school, or state school while living at home.