Others such as Scot McKnight, a professor of theology at North Park University in Chicago, said they welcomed the renewed discussion of one of the hardest issues in Christianity — can a loving God really be so wrathful toward people who faltered, or never were exposed to Jesus? In an interview and on his blog, he said that the thunder emanating from the right this week was not representative of American Christians, even evangelicals. According to surveys and his experience with students, Mr. McKnight said, a large majority of evangelical Christians “more or less believe that people of other faiths will go to heaven,” whatever their churches and theologians may argue.

“Rob Bell is tapping into a younger generation that really wants to open up these questions,” he said. “He is also tapping into the fear of the traditionalists — that these differing views of heaven and hell will compromise the Christian message.”

Mr. Bell, who through his publisher declined to comment on the book or the debate, has resisted labels, but he is often described as part of the so-called emerging church movement, which caters to younger believers and has challenged theological boundaries as well as pastoral involvement in conservative politics.

As the controversy exploded last week, HarperOne moved up to March 15 the publication date of Mr. Bell’s book, “Love Wins: A Book About Heaven, Hell, and the Fate of Every Person Who Ever Lived.”

Judging from an advance copy, the 200-page book is unlikely to assuage Mr. Bell’s critics. In an elliptical style, he throws out probing questions about traditional biblical interpretations, mixing real-life stories with scripture.

Much of the book is a sometimes obscure discussion of the meaning of heaven and hell that tears away at the standard ideas. In his version, heaven is something that begins here on earth, in a life of goodness, and hell seems more a condition than an eternal fate — “the very real consequences we experience when we reject all the good and true and beautiful life that God has for us.”