How do you decide, when you're writing, how much info is enough info and how much info is too much or too little in terms of describing a setting or scene or character's appearance or background. For example, if I was writing about, say, religion, and my audience is a crowd of faith, should I not go into great detail about the religion and focus on the story or go ahead and describe what the reader already knows? Or, how about the reverse? What if I'm writing a Sci-Fi story about a planet far-far-away and it resembles nothing of our planet? Should I spend paragraph after paragraph covering these details or should I just leave a lot to the reader's imagination? Thanks.