This CC is based loosely on three different characters of 3 different religions, each praying to one of the petitionable leading figures of their faith i.e., a christian praying to God (or Jesus), or the Holy Spirit, or Mother Mary, or St. Christopher or etc etc.
Another might be a muslim praying to Mohammed or some other Islamic figure who may be prayed to.
Judaism of course is another big one.
Cults can be used as well, after all they do represent groups with spiritual adherents and leading figures.
Non-theistic religions may also be used i.e., Jainism, in which case some type of meditative thought would substitute for prayer.
You choose the characters and backgrounds and religions (or spiritual focus) that the characters address.
Due to the fact that within any given religion there are many branches which ardently disagree with each other to different degrees, the comic could have 3 christian characters with different fundamental beliefs. Thus they could be praying the same prayer with dramatically different emphasis.
The comics could also include God figures responding, or not.
Your thoughts on how to arrange it et al are of course required.
As I'm writing this, I'm suddenly hoping it doesn't turn out to be one of those that's too damn complicated. I hope it becomes easier by allowing you to modify these loosey goosey rules in a ton of different ways.
I hope to judge it in approximately 2 weeks. I'm also working on an example comic which I will post if it gets done.