I have a few thoughts on this issue.
1 - What is it that you actually want to do for a career that leads you to want to go for this further degree?
a - Christian Education director at a church - you don't need a Masters for this
b - Teach at a Christian School in grades K-12 - you don't need a Masters for this
c - Teach at a Christian College - you need a Masters (at least) for this
2 - Will it be worth the money and time?
a & b - I don't think so. I think you'd be better off, just going directly into the field. You'll learn more from doing it, than you would in the classroom, and you'll save thousands of dollars. That will mean that you'll be able to be more flexible to follow whether God calls you to ministry instead of being limited to jobs that pay well enough to pay off your massive education debt.
c - I would still recommend starting smaller (perhaps teach HS first) and most schools will pay for your Masters for you if you go for it while working for them. Then when you finish you could apply to work at colleges, and you'll have both the degree and some real teaching experience.
3 - Will it be good for your faith?
I know it seems obvious that going for further Christian education should be GOOD for your faith. However, my experience is that too often it is the other way around. The Bible talks about how "knowledge puffs up", and I have seen it happen too frequently that people go to Seminary and learn a lot of stuff that tickles their own intellectual pride. They learn the ancient languages of Greek and Latin, and about the cultures of people of the Bible, and about how to "correctly" interpret the Bible. After all this, it is just too easy for them to set themselves up as the authority of truth. Instead of the Bible (unchanging divine source) being the supreme authority it becomes their own brain (changing human source), and they are easily misled by whatever expert's book they happen to be reading at the time.
