CRANSTON, R.I. — She is 16, the daughter of a firefighter and a nurse, a self-proclaimed nerd who loves Harry Potter and Facebook. But Jessica Ahlquist is also an outspoken atheist who has incensed this heavily Roman Catholic city with a successful lawsuit to get a prayer removed from the wall of her high school auditorium, where it has hung for 49 years. . .

For Jessica, who was baptized in the Catholic Church but said she stopped believing in God at age 10, the prayer was an affront. “It seemed like it was saying, every time I saw it, ‘You don’t belong here,’ ” she said the other night during an interview at a Starbucks here. . .

New England is not the sort of place where battles over the division of church and state tend to crop up. It is the least religious region of the country, according to the Pew Forum on Religion and Public Life. But Rhode Island is an exception: it is the nation’s most Catholic state, and dust-ups over religion are not infrequent. . .

Does she empathize in any way with members of her community who want the prayer to stay?

“I’ve never been asked this before,” she said. A pause, and then: “It’s almost like making a child get a shot even though they don’t want to. It’s for their own good. I feel like they might see it as a very negative thing right now, but I’m defending their Constitution, too.”

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