I am writing from the UK. We are a multi cultured society, therefore we have disagreements over religion. I have many friends who say they don't know what they believe in. Or that religion doesn't matter.
I say that the WRITER MUST know this about the character. I know that at this point some may disagree, but let me explain.
Despite the writers personal views, whether we admit it or not, religion is a definite factor of society. In the UK it doesn't matter what you believe, the shops are still closed on a Sunday morning, Christmas music starts playing in department stores as early as October.
I think religion either plays a big part of someone's life or no part at all. However, it will affect how your character behaves. So today's editing checklist.
Do you know what religion your character is?
Does he or she believe?
Are they observant?
Do they go to confession?
Wear a cross?
Pretend they are not in if Mormons come to the door or listen politely?
How does he or she feel about religion compared to the rest of the family?
Would they have a church wedding to please their Mum?
Is he on she ready to believe in something or is spiritual without going to an organised event?
Do they have guilt? Or are they rebelling? Do they dislike rituals?
Do they follow the latest New Age trends? Are they open to different beliefs?
When did they become devout or lose faith? What triggered it?
Do they have any beliefs that lurk beneath the surface that they don't know they have?
If you spend just a few minutes thinking about your characters religious background you will gain a deeper understanding on how they will react to events in your plot!