In homilies, lectures, op-ed articles, books, and a weekly online column, Chaput unflinchingly assails presidents, lawmakers, academics, and the media when, in his opinion, they "marginalize God."
Writing in last Sunday's Inquirer, he described as "dangerous and insulting" the Obama administration's mandate that religious-affiliated hospitals, schools, and charities provide employees with free contraception coverage.
President Obama's plan was the most "aggressive attack on religious freedom in our country . . . in recent memory," Chaput wrote, lambasting it as "the embodiment of a culture war."
Taking their cues from the United States Conference of Catholic Bishops, many other prelates condemned the policy. But Chaput's attack stood out, eliciting praise from conservative Catholic groups and dismay from church liberals.
"Incendiary and divisive," said a spokesman for Catholic Democrats, a liberal advocacy group for the poor.
Branding Chaput a "Taliban Catholic," Sean Michael Winters, a columnist for the liberal weekly National Catholic Reporter, said the tone of the column "invited people not to look at the details" of Obama's proposal.
Conservative Catholics disagreed.
"Brilliant," the National Right to Life News called Chaput's essay.
It was the most-viewed item last week on the Catholic News Agency's website. It also prompted 167 comments on The Inquirer's website, where opinion ran about 2 to 1 against him.
"Get out of the dark ages," one reader chided.
Another cheered, "Our church has sorely needed a voice like [Chaput's] for years."
An unscientific sampling of local Catholics, based on random interviews at 30th Street Station, suggested many do not share their archbishop's position in the contraception debate.