VATICAN CITY (Reuters) - Pope Benedict led the world's Catholics into Easter on Saturday at a Vatican service where he baptized a Muslim-born convert who is one of Italy's most famous and controversial journalists. The German-born pontiff, marking the third Easter season of his pontificate, began the service in the atrium of a darkened St Peter's Basilica where he carved the Greek letters Alpha and Omega on a large candle. The basilica became a sea of flickering flames as thousands of faithful inside lit candles before the lights were turned on in a ritual symbolizing the darkness in the world...