Pope Francis says he wants missionary, merciful church for poor.
Ceremony might see two living popes honoring two dead ones.
Denounced "throw-away culture," cited need to defend the unborn.
Believers should make a "mess" by spreading the faith.
Francis urged special prayers for China's faithful, long the source of concern for his predecessor Benedict XVI.
Pope and Merkel, mindful of Christian vote, discuss a Europe focused on values, assistance.
Two doves owe their freedom, including a soaring flight over St. Peter's Square, to Pope Francis.
Ceremony highlighted the ongoing persecution of Christians.
A sign of improving ties following the election of new leaders for both churches.
An 87-year-old Argentinian woman is leading a campaign urging Pope Francis to reconsider the issue.
