Lyric discussion by Azarak 

Cover art for Return Trip lyrics by Electric Wizard

I reckon Returntrip68 has it right. Because there are actually more lyrics after these original ones, he says.

"Lord forgive me, for I have sinned. But I'll never sin again. No, no, no I'll never sin again"

So on and so forth. This supports the Cannibal Ferox influence because it is most obviously from the perspective of Mike, him saying "I'll never sin again." To get rid of the pain that he has endured, because in the movie, Mike tortures one of the tribe members in a village. And after that, he and the others get captured and are tortured.