Reality Check, and delivered with much care:
I think you really, really need to think hard about why you’re planning to go to graduate school to study a topic that has no marketable outcome. Unless you are living on a trust fund, you need to find a job when you graduate. No one is going to hire someone with a Masters in Church History.
Even if you go on to get a PhD, your job prospects are incredibly slim. You could, perhaps, teach at a college or university. But those jobs are very hard to come by these days. You’ll likely end up teaching as a part-time adjunct, with no job security, working on a semester-to-semester contract basis that could end at any time. My wife is a part-time college instructor. It works out really well for us because it gives her flexibility: she never knows how many classes she’ll get from semester to semester. But if she relied on it as her sole income, life would be extremely difficult. Also, I hate to bring up the Affordable Care Act, but because of health benefits obligations, her college eliminated an entire classification of faculty (the so-called "Part-Time Permanent Instructor’) so as to avoid paying their benefits. Her net income is now around $30k per year. And she has a PhD (engineering). Truth be told, she hasn’t sought a full-time position.
My sister-in-law was in a tenure track professorship (History) at a small college, but she gave it up when she and my brother moved to a different city. That was about five years ago and she has yet to find another full-time teaching position, even through they now live in a big city with a lot of colleges and universities. She, too, has a PhD.
Hey, I love Education. I’m all for it. But if one of my kids had a plan like yours, I wouldn’t be supportive (because I’d end up being $$ supportive in the end.)