My parents' church has a big ol' Christmas concert/play each year, and this year they did Dickens' Christmas Carol. Now if you've read it you know that Dickens somehow managed to write a whole book about Christmas and Scrooge's conversion and yet didn't say a thing about God. (I know, "God bless us, every one!" but Tiny Tim was using a figure of speech.) But this was not a problem for my parents' church. They just tweaked it, writing the Gospel in as it suited them. :)
I think you can't really take a play that's vague on religion, and graft in some explicit lines, and have it sound right. There needs to be a sense of God throughout the whole play so that the explicit lines when they come fit like the last piece of a puzzle that reveals the whole picture. Instead they seemed out of place. Or maybe the problem was that the new lines used modern American Evangelical language and that's not how Victorians of any denomination would have put things. Can't help that; who can write like Dickens any more?
I'm only being nitpicky; it was a great concert and play and I loved seeing everyone (many of whom I knew) in Victorian costume. Particularly this person, accessorizing with chains:
It's my dad! He played Marley's ghost, and as soon as I heard he'd been cast I thought, "Oh, this is going to be good!" He's perfect with the dramatic wails and the deep spooky voice and the scary look. You should have heard him reading to us when we were kids. But I assure you that when he's not in character he's a very nice dad. :)