Miss Watson calls Heaven the “good place” and she says that Huck will not go there if he continues to be bad.
Huck’s experiences with religion are generally not positive. He considers praying useless because you can only ask for spiritual gifts. He feels reading the Bible is a waste of time because the people are dead. He does not understand Miss Watson’s point.
She said it was wicked to say what I said; said she wouldn't say it for the whole world; she was going to live so as to go to the good place. (Ch 1, p. 6)
Huck personally feels that it is better to go to Hell than Heaven, because if Miss Watson is in Heaven, it must be boring. He figures Tom Sawyer will likely be in Hell anyway, so he’ll have company.
Twain bitterly and hilariously satirizes religion throughout the book. His main problem is with hypocrisy. He also does not approve of people who use religion as a crutch, like Miss Watson. She is rude to Huck, and makes no effort to understand him.