today, more than 2 billion people call themselves christians, people who believe jesus rose from the dead. but perhaps it's a miracle that christianity did not disappear when the romans crucified jesus on a lonely hill outside jerusalem almost 2,000 years ago. >> this region, jerusalem and judea, represented an important land bridge between syria and egypt. so throughout history, this has been a critical place. >> jerusalem had been the holy city of judaism for more than 1,000 years, a place that the romans had occupied since 63 b.c.