These days GirlGuiding has moved away from god (which I agree with), and recognises that everyone is different and holds different beliefs. This activity could be quite sweet.
The line ‘be true to myself and develop my beliefs’ is the basis of this game.
Paint a tree (might be best to do this beforehand!) and then cut out leaf shapes, with each girl adding their belief to it. You’ll get all sorts of answers, and it’ll probably be quite sweet (and funny). Plus this ticks off one of the parts of the Adventure Badge too.
In addition it would look pretty cool if you have a message board to display things.