I think it makes sense, though, since Catholicism is such a deep part of Helena's character.
Her story in Birds of Prey, from someone who's so angry and isolated she has nothing holding her back from lethal justice, to someone who is a vital, valued part of a family again, is one of my very favorites (and if she'd had a run like Steph, she might have supplanted her as my favorite purple clad heroine, since I actually loved Helena first, since I got into comics more heavily right after War Games, which wasn't a very Steph-rich period, but it was a golden era for Helena).
I don't know about rookie Batman - she was The Bat. She never called herself Batgirl, and only took the mask because it worked, not because she really bought into Bruce's crusade like any of the other Batgirls. (What's the third, in your view - Betty/Bette? I wish there was more stuff for all of them - Bette, Babs, Helena, Cass, Charlie, Steph, Nissa, and Carrie. Wow, eight of em. I wonder how many Robins there would be if you counted all the alternates...Dick, Jason, Tim, Steph, Damian, Robot, Tris, the billion We Are Robins)