What is Huck really mean when he says "Alright then, I'll go to hell"?

Okay so I’m writing a paper about Mark Twain conveying his atheism through Huck. When he says this is he basically “giving up” on organized religion and christianity or is he letting his love overpower him and he honestly thinks he’ll go to hell for not turning in Jim?? .. basically is he christian at that point or not?