In a spirited retort to the Vatican, a group of Roman Catholic nuns is planning a bus trip across nine states this month, stopping at homeless shelters, food pantries, schools and health care facilities run by nuns to highlight their work with the nation’s poor and disenfranchised.

The bus tour is a response to a blistering critique of American nuns released in April by the Vatican’s doctrinal office, which included the accusation that the nuns are outspoken on issues of social justice, but silent on other issues the church considers crucial: abortion and gay marriage.

The sisters plan to use the tour also to protest cuts in programs for the poor and working families in the federal budget that was passed by the House of Representatives and proposed by Representative Paul D. Ryan, a Wisconsin Republican who cited his Catholic faith to justify the cuts.