The people show blind faith in religion.  They accept whatever the preacher says and they also easily accept that the con man's story of being reformed.  They are gullible and trusting as well as fervent in their religion.  I don't think that Twain approves of their behavior.  Twain encourages skepticism and almost picks fun of the absurd way that people accept anythin.
Huck knows that if he tells the con man that he knows they are frauds that it will cause trouble.  As long as they don't want anything ridiculous or push it too far, it is easier for Huck to just go along with their lie.  Huck is a practical person and he knows it will be easier to just go along with their plan.
Jim thinks that the moon made all of the starts.  He compares the moon to a frog.  If a frog can lay lots of eggs at once than the moon can give birth to a bunch of stars at once.  He also says that the moon has lots of time up there so it would make sense.  To Jim and Huck Jim's theory makes good sense.  
I think that every time Huck is on shore something bad inevitably happens.  Also whenever Huck is on shore someone always tries to take care of him, but also to force him into their way of thinking.  Huck prefers the freedom of being on a raft to having a real home on land.  On the raft Huck is free of the judgement of society, and he and Jim can be friends. There are fewer disputes and less problems on the raft
I think that Twain is satirizing the way that people practice religion.  He is making no social commentary on religion, just the fact that people forget what the real meaning of religion is. I think that the satirizing of the way people practice religion is perpetuated by the way that the Grangerfords and the Shepherdsons constantly fight with each other ev
I think they are basically good people with bad motives. I'm not quite sure why the Shepherdsons hate them so much.  Their feud is ridiculous.  The Grangerfords are no worse than the Shepherdsons.   They are fine people who have no motive to hate their neighbors, but they hate them anyways.  
Huck is appalled by Jim's want to free his children.  Huck still looks at slaves as less than people and more like property. Huck starts to question whether it is okay for him not to turn in Jim, because he thinks of Jim as a thief.   This helps to satirize slavery because it is ironic that Huck doesn't think that Jim deserves to have his own children.  It speaks of how people didn't think of slaves as people but more like livestock.  
Huck tells the men searching for runaway slaves that he is thankful that someone will finally help him.  He says that his family is in the raft and that they have smallpox. The people that were supposed to search the raft are so afraid to get smallpox that they don't want to look in it.  They give Huck some money and tell him to go to the next town and try to get a doctor to help heal his familiy.  
Huck and Jim plan to ride on their raft to Cairo on the Ohio river.  Once they get to Cairo Huck and Jim are going to sell their raft and all of the stuff they got from the robbers, and buy tickets for a ferry.  They were going to ride the ferry north until they reach freedom.  Once they are safely in the free states, Jim is going to try to get his family back.
Huck enjoys living in nature.  He has never liked the strict social rule, and he disliked it when Miss Watson and Widow Douglas tried to civilize him.  Although he is content living by himself near the river, he also misses people.  Huck is really happy when he gets to see Jim even though it startles him that Jim ran away from Miss Watson.  Huck's defiance of social norms when he doesn't turn Jim in also illustrate Huck's lack of caring for society and its rules.  Huck likes not having to deal with rules and society.