Lebanon is the only Arab state not officially Muslim and has the highest proportion of Christians of any Middle East country. Although politically segmented, the constitution attempts to distribute power equally. The president is a Maronite Christian, the prime minister a Sunni Muslim and the speaker of parliament a Shia Muslim. Syrian refugees now comprise a quarter of Lebanon’s population. Some of Lebanon’s Christians can trace their origins as far back as the 5th century. For centuries, Christians have had a strong presence in the country, but a huge influx of Sunni Muslim refugees fleeing Syria is threatening the delicate political balance, bringing violence and complex political dynamics.  Shia militant Islamist group Hezbollah, provides protection for Christian communities against Sunni jihadi groups. Lebanese Christians are a minority group divided between opponents and supporters of Hezbollah and are more vulnerable than at any time in recent history; living in conflict, enduring poverty and facing aggressive Muslim attitudes moulded by years of sectarian divide.