I do not know this specific person but every member of the family I know was Greek Orthodox.
In Greece, two well known individuals are:
George Voutsinas born Leukada 1874, died Athens 1938. Greek writer and Journalist, Prefect of Serra, Thessaloniki, & Achaia. Editor of the papers PATRIS & AKROPOLIS, etc.
Ioannis Voutsinas. born Odessa 1834, died Odessa 1902. Poet. Family was originally from Kephalonia. Did go to school in Syros but returned to Odessa. Was a merchant in odessa.