Prince Boris N. Shakhovskoy (1870–1926), the Russian consul in Damascus from 1907 until the First World War, left to his descendants a legacy of attentive and balanced diplomacy. His reports to the Russian Embassy in Constantinople and to the 1st Division of the Foreign Ministry contain invaluable information shedding light on interfaith relations in the Syrian regions of the Ottoman Empire on the eve and after of the Young Turk Revolution, as well as on the early months of the so-called Great War (WWI). The article analyzes the messages of the diplomat on various aspects of the religious situation in the region. He considered the activities of the Islamist organization Muslim League in Damascus, which aimed at enforcing Sharia law throughout Syrian society and countering non-Muslim and European influence in the region. An anxious change in interfaith relations is being evaluated, when Muslim suspicion towards Christians grew, aggravated by the common conscription in the context of the Tripolitan and two Balkan wars. The consul attentively followed the problems of the participation of the Orthodox Arabs in the Ottoman institutions, as well as the attempts to join the English Old-Catholics to Orthodoxy, acting through Metropolitan of Beirut. Of historical interest is also the information about the transition of the Syrian Jacobites to Catholicism, as well as notes on the Catholic missions activities in the region. All these issues in the Syrian soil are viewed by the diplomat through the prism of competition between European powers, especially France and Italy.