There's a slow synthy '80s song, I think it may be Yaz, during which a male voice keeps saying prayer-like things, such as "thy will be done" and so on. Any ideas?

frostingspoon, I'm looking at you.

"Love, Thy Will be Done" by Martika? That's 1991 though...

I think you're thinking of Dan Reed Network "Thy Will Be Done"

I'll ysi it a little later. Think I have it growing moss somewhere.

Oh, wait, you said it's a slow song. Not Dan Reed, then.

I'll think harder, get back to you.

In my memory, it has female vocals that sound kind of Alison Moyet-like. The male prayer voice is kind of background, sampley stuff.

A long shot but is it:

Visage - Fade To Grey

"Fade To Grey" is male vocal with female French backing, like proto-Enigma as done by Gorgio Moroder. Must be a different song.

my synth-pop roomie might be able to help with this one... I'll ask him.

Yaz, "I before E except after C"?

"...Outside, you can see the difference; inside, you can feel the difference..."

Shit like that?

My roomie says: "In My Room" by Yaz/Yazoo

Apparently the guy in the background is saying the Lord's Prayer.

I think that's it. Told you it was Yaz.

My roomie is the man when it comes to 80s electro pop knowledge. He kicks it. I think he was happy to be of service.

And I thank him. And you.