Editor snobbery digression: that would be poor writing. The job of signaling the main subject of the article belongs to the headline and lede, and "Christian saints" is right there.
No, that phrase is just filler. And IMHO it's basically wrong. Certainly if the author want to show that Christianity is more likely than other religions to import ideas, the article has a lot more work to do than point out one myth. Literally everyone does this.