Millions of people have been arriving in the Saudi Arabian city of Mecca for the Muslim pilgrimage known as the Hajj. The annual ritual marks a high-point in the religious lives of many Muslims. But for one US convert who is making the trip for the first time, it is just the next logical step in a journey of faith already well underway. Al Jazeera's Sebastian Walker brings us this story from Falls Church, in the state of Virginia.