He's the first non-European pope for more than a thousand years and he's received goodwill messages from around the world.<br /><br />But Pope Francis, the former Archbishop of Buenos Aires, faces a series of tough challenges.<br /><br />The Catholic Church has been dogged by infighting and scandals over clerical sex abuse and alleged corruption. <br /><br />Al Jazeera's Paul Brennan reports from Rome on the Pontiff's first day in office.
