Chapters 15 1. does huck seem to have more faith in superstition or religion? provide sound reasoning for your response. 2. what are some key differences between miss watson and the widow douglas? 3. twain chooses a 13-year-old boy as the narrator

I would say it is superstition. Huck wants or prefers the wonder and creativity of superstition. Huck just doesn't get the foolishness, silliness and hyprocrisy of an organized Christianity. He is able to connect specific occurrences in his life to superstition rather than the  religion. 
The severe Miss Watson and gaunt is the most protuberant.representative of the ethical values and hypocritical religious Twain criticizes in the novel. The Widow Douglas is gentler in her beliefs and has more patience with the mischievous Huck. 
The boy is exploring adolescence and it is a time of self-discovery. This is when the children test the boundaries of what they have come to accept. Huck does not take face value in the society. Twain picked a perfect age to develop his protagonist.