why do tom and huck believe that in joe isnt struck by lighting

When Injun Joe openly lies and frames Muff Potter for the murder, both Tom and Huck half expect "God's lightening upon [Injun Joe's] head" as punishment." When they see Joe again they think that he probably sold his soul to the devil.

Injun Joe repeated his statement, just as calmly, a few minutes afterward on the inquest, under oath; and the boys, seeing that the lightnings were still withheld, were confirmed in their belief that Joe had sold himself to the devil.

Why do tom and huck believe that joe sold his soul to the devil

What does Tom like most about the new life he has chosen