Mexico has modified its regulations to let public officials attend religious services, but only in a strictly private capacity.
The new rules update an 11-year-old religious association law that made it awkward for top officials to worship.
``In religious acts or activities, the public servant cannot at any time present himself or take action as a government official,'' according to the new rules.
Church-state separation is closely watched in Mexico. Many remain suspicious of the Roman Catholic Church, which held a government-enforced monopoly of faith for three centuries. But believers remember 20th century repression of religion.
President Vicente Fox raised eyebrows by kissing Pope John Paul's ring when he visited in 2002. In June, Labor Secretary Carlos Abascal triggered controversy by attending a Mass for Saint Tomas Moro, patron saint of politicians.