Until you try, you probably won't realize how difficult devotional articles are to write. In the 1980s, I wrote devotionals for a variety of magazines. They don't pay much ($10 to $25) and some don't pay anything, but I loved the discipline. I couldn't use extra words, limp phrases, or repetitions. Every word had to justify itself. My first draft often hit 600 words and I had to delete two-thirds of the text and still retain the heart of the material. I loved the discipline.
Here's the next rule: You're forced to stay with one idea. Any good article does that, but if you write for this market, you become aware of sentences that may be interesting, but aren't germane to the topic you address, and you delete them.
One idea expressed well and succinctly:
That's the secret of writing devotionals.