Blind Faith
Loved the theme! Before the theme was announced, I was thinking about a turn-based soccer game with RPG elements, but I guess this would require too much work to become interesting (same mistake as last year). Now I came with an idea that could become interesting with much less work (or so I think). And I even got a great name!
Blind Faith will be a stealth god game. You are a deity. Your worshipers always thought you were invisible, which is unfortunately not true. So, you must do your god things while hiding from your worshipers, as being seen would reduce the faith they have on you.
I am happy with the concept. Next step: turn this into a more concrete (if incomplete) design.