The story of his changing views on Hell is the topic of an excellent episode of This American Life. Here's what Bishop Pearson had to say about Hell.
The God we've been preaching is a monster. He's worse than Saddam; he's worse than Osama ben Laden; he's worse than Hitler. Because Hitler just burned 6 million Jews, but God is going to burn at least 6 billion people. And burn them forever. He has this customized torture chamber called Hell were he's going to torment and torture people, not for a few minutes, hours, days, or weeks, but forever.Here are two of the verses that he uses to justify his belief (or lack of belief) in Hell. (I've added them to Does Hell exist? at the SAB.)
We trust in the living God, who is the Saviour of all men, specially of those that believe. 1 Timothy 4:10
He is the propitiation for our sins: and not for our's only, but also for the sins of the whole world. 1 John 2:2