By Eric Marrapodi, CNN Belief Blog Co-Editor

Rob Bell, a pastor and author who has achieved rock star status in the Christian world, is preaching a false gospel, his critics say. And some of those critics are Christian rock stars in their own right.

The pastor of Mars Hill Bible Church in Grand Rapids, Michigan, Bell has authored a book called Love Wins: A Book About Heaven, Hell, and the Fate of Every Person Who Ever Lived, which ignited a firestorm of controversy over the weekend, weeks before it arrives in bookstores.

On Saturday, in a blog post on the popular Christian website The Gospel Coalition, Justin Taylor blasted Bell's new book, out March 29, for teaching "false doctrine":

I’m glad that Rob Bell has the integrity to be lay [sic] his cards on the table about universalism. It seems that this is not just optimism about the fate of those who haven’t heard the Good News, but (as it seems from below) full-blown hell-is-empty-everyone-gets-saved universalism.

Universalism, in its broadest terms, preaches that everyone goes to heaven and that there is no hell. Critics say it represents a break from traditional Christianity, which they say holds that heaven and hell are very real places. In most Christian circles, universalism is a dirty word.

Taylor's post was quickly tweeted by several prominent pastors, including John Piper and Mark Driscoll, connected to the Gospel Coalition, a coalition of theologically conservative evangelical churches, and a full-blown theological controversy was on. By Monday, Taylor's response post had racked up a quarter million hits.

Other bloggers, meanwhile, are calling Bell an outright heretic.

Bell is not the first prominent Christian pastor to be recently accused of wading into theologically troubled waters. Bishop Carlton Pearson, once a mentee of famed Pentecostal televangelist Oral Roberts, has been run out of two churches and branded a heretic for preaching what he says is a gospel of inclusion with broad universalist themes.

Last year, Brian McLaren - a popular Christian author and a former pastor - was accused of breaking with Christian orthodoxy and delving headlong into universalism in his book A New Kind of Christianity.

But it's rare that theological arguments become top ten trending topics on Twitter, as Rob Bell did on Saturday.

“To be honest, it was a pretty rough weekend,” Taylor said in a phone interview. The 34-year-old heads the editorial content for Crossway, a Christian publishing company in Wheaton, Illinois. Taylor he says his blog expresses his personal opinion not the opinion of the coalition.

"We’re talking about the big things here, things that have been historically defined as orthodox, " he said. "I have a high degree of confidence in what God is saying and what we can understand."

Though many things that separate Catholics, Protestants, and Orthodox Christians, “this isn’t one of them," Taylor said. "We’ve historically agreed on many things, the person of Christ, heaven and hell. This isn’t a peripheral academic debate. What Rob Bell is talking about gets to the heart of Christianity.”

Taylor has not read Bell's forthcoming book in its entirety. His blog post was in response to the description released by Bell publisher HarperOne and a promotional video that features Bell.

"Rob Bell hasn’t sinned against me personally,” Taylor said, which is why he did not go to Bell before making his comments public. Instead, Taylor said, Bell's book represents a clear example of false teaching.

In the promotional video Bell refers to the nonviolent Indian independence leader Mahatma Gandhi, a Hindu, and asks, "Gandhi's in hell? He is?"

"And someone knows this for sure?" Bell continues. "Will billions and billions of people burn forever in hell? And if that's the case how do you become one of the few? "

The video follows a trend in Bell's career as a pastor: he has long asked tough theological questions and challenged traditional answers. The short promotional video raises lots of questions without offering definitive answers.

"What we believe about heaven and hell is incredibly important because it exposes what we believe about who God is and what God is like," Bell says in it. " The good news is that love wins."

Those lines raised eyebrows for Taylor and others. "It is not preaching the gospel as found in the New Testament," Taylor said. "The New Testament is pretty clear if someone preaches a false gospel… that we are to reject that and have nothing to do with them."

For all his hipster leanings - including black rimmed glasses - Bell has a traditional pedigree. He went to Wheaton College, the Harvard of Christian schools, and later graduated from Fuller Theological Seminary with a Master of Divinity.

But the Mars Hill Bible Church, which Bell founded, is not attached to any denomination. Were it attached to one - the Presbyterian or Catholic church, say - his book and video could raise eyebrows in the hierarchy and might lead to a church trial that could result in Bell's expulsion.

"A larger denomination would take his credentials and excommunicate him like they did to me,” Bishop Pearson told CNN.

By Sunday evening, Pearson was getting sent articles about the Bell flap. He said it reminded him of his days as a charismatic leader of a big church in the largest Pentecostal denomination. His questioning of hell from the pulpit led to his ouster.

"What happened to me is happening to Rob Bell," Pearson said. "If you denounce hell, it's like you are denouncing God. You’re going to be called a heretic."

“I thought my people loved me and would walk through the valley of the shadow of death with me, but they didn’t,” Pearson said.

Bell's church did not respond to requests for an interview. His Twitter feed has been silent since he posted about writing a piece for CNN's Belief Blog a few weeks ago. His publicist at HarperOne said he would not be doing publicity until his book hits shelves.