It may come as no surprise that members of Westboro Baptist Church, an extreme Calvinist sect notorious for its fire-and-brimstone picketing, are planning to protest at the upcoming Reason Rally — a national gathering of atheists. But at this event, they will also be picketing one of their own, rally organizers said.

In the speaking lineup at the March 24 rally in Washington is Nate Phelps, one of 13 children of Westboro Pastor Fred Phelps. The younger Phelps, who split from the family when he was 18, is a self-described atheist who advocates for gay rights and on behalf of abused children. He charges that his father abused his children in the name of God and uses his church as a vehicle for his rage.

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At the rally, Phelps will join a lineup of celebrities in the secular orbit — author Richard Dawkins, Discovery Channel "Mythbusters" host Adam Savage, comedian Eddie Izzard, the band Bad Religion and others.

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The Scranton Atheism Examiner reported that the letter was answered by Megan Phelps-Roper, one of the pastor's daughter's, on Twitter:

"The fool hath said in his heart, There is no God” Ps14:1 Here's lookin' at you, @ReasonRally!Your [unwarranted] pride is your destruction. Dear @ReasonRally: How gracious of you! We accept your invitation & will picket your parade of fools 3/24. Love,WBC."