Question: San Giorgio is the Italian name for a saint who was a martyr of which religion?

Context paragraphs:
Bank of Saint George: The Bank of Saint George (Italian: "Casa delle compere e dei banchi di San Giorgio" or informally as "Ufficio di San Giorgio" or "Banco") was a financial institution of the Republic of Genoa.  Founded in 1407 to consolidate the public debt which had been escalating due to the war with Venice for trading and financial dominance.  The Bank's primary mission was to facilitate the management of the San Giorgio shares ("luoghi").  It was the oldest chartered bank in Europe and of the world.  The Bank's headquarters were at the Palazzo San Giorgio, which was built in the 13th century by order of Guglielmo Boccanegra, uncle of Simone Boccanegra, the first Doge of Genoa.

Saint George: Saint George (, "Geṓrgios"; Latin: "Georgius" ; to 23 April 303), according to legend, was a Roman soldier of Greek origin and officer in the Guard of Roman emperor Diocletian, who was sentenced to death for failing to recant his Christian faith.  As a Christian martyr, he later became one of the most venerated saints in Christianity and in particular the Crusades.

Baluardo a San Giorgio: The Baluardo a San Giorgio (English: bastion of San Giorgio) is a trapezoidal shaped enclosure that is part of a line of historic fortifications of the city of Florence.  Located along the walls of Florence, near the Porta San Giorgio, in the south-west of the city, it is also known as the Baluardo della Ginevra, due to the presence at one time of a nearby spring called the Ginevra.

Jacopo Avanzo: Jacopo Avanzo (or Avanzi or Da Vanzo,) of Verona, has long been confused with Jacopo degli Avanzi of Bologna; but the remains of an inscription in the Cappella San Giorgio point to Verona as the birthplace of Avanzo.  He painted decorations, in conjunction with Altichiero da Zevio, in the Cappella San Felice and the Cappella San Giorgio in the church of Sant' Antonio at Padua, in 1377.  It appears that the principal frescoes in the Cappella San Felice were the work of Altichiero; and of those in the Cappella San Giorgio, which were recovered from oblivion in 1837 by Dr. E. Förster, the part to be assigned to Altichiero has given rise to much dispute; but it is thought by some authorities that Avanzo executed the principal portion.  The frescoes represent the earlier part of the 'History of our Lord,' the 'Coronation of the Virgin,' the 'Crucifixion,' and 'Legends of St. George, St. Catharine, and St. Lucy.'  They prove the painter to have been an artist of no common genius, and Kugler, in his description of them, speaks of his art as being above that of his contemporaries.  Avanzo also painted two triumphal processions in a public hall of Verona, which have long since perished.  He died about the end of the 14th century.

San Giorgio Monastery: The San Giorgio Monastery (English: St. George Monastery ) was a Benedictine monastery in Venice, Italy, located on the island of San Giorgio Maggiore.  It stands next to the Church of San Giorgio Maggiore, which formerly served the monastic community, and currently serves as the headquarters of the Cini Foundation.

San Giorgio di Nogaro railway station: San Giorgio di Nogaro (Italian: "Stazione di San Giorgio di Nogaro" ) is a railway station serving the town of San Giorgio di Nogaro, in the region of Friuli-Venezia Giulia, northern Italy.  The station is located on the Venice–Trieste railway.  The train services are operated by Trenitalia.

Ceresiosaurus: Ceresiosaurus, is an extinct aquatic genus of lariosaurine nothosaurid sauropterygian known from the Middle Triassic (Anisian-Ladinian boundary) of Monte San Giorgio, southern Switzerland and northern Italy.  Ceresiosaurus, meaning "Lizard of Ceresio" (Ceresio is the name of the Lake Lugano, in Switzerland).  The type species, "Ceresiosaurus calcagnii", was named by Bernhard Peyer in 1931.  "C. calcagnii" is known from both the Cava superiore and Cava inferiore beds of the Lower Meride Limestone at Monte San Giorgio, dating to the latest Anisian of the Middle Triassic.  Rieppel (1998) suggested that the back then monospecific genus "Ceresiosaurus", is a junior synonym of the better known "Lariosaurus", yet he kept it type species as a separate species under the new combination "L. calcagnii".  In 2004, however, this synonymy was objected by Hänni who described and name a second species of "Ceresiosaurus", "C. lanzi" - a separation supported by several other authors since.  This species is known only from the stratigraphically younger Cassima beds of Monte San Giorgio, although also from the Lower Meride Limestone, dating to possibly the lowest Ladinian age.  The species in a subtropical lagoonal environment with varying open marine influences, and alongside many related but smaller species of nothosaurids and pachypleurosaurids. "Ceresiosaurus" represents one of the largest vertebrate of up to 3 m snout-tail length from the very diversified paleoenvironment of the Middle Triassic Monte San Giorgio.

San Giorgio dei Genovesi, Palermo: The Church of Saint George of the Genoese (Italian: Chiesa di San Giorgio dei Genovesi or simply San Giorgio dei Genovesi) is a Renaissance church of Palermo.  It is located near the port of La Cala, in the quarter of the Loggia, within the historic centre of Palermo.

San Giorgio: San Giorgio, is the Italian form of Saint George.  When used as the name of a person it is frequently contracted to Sangiorgio.

Pol. San Giorgio a Cremano: ASD San Giorgio a Cremano (also known as 'San Giorgio Calcio', and 'San Giorgio 1926') is an Italian association football club, first founded in 1926, and based in San Giorgio a Cremano, Campania.  The club currently competes in the Eccellenza Campania – Group A, having been relegated from Group A in the 2011–12 season.  They play their home games at "Stadio Comunale Raffaele Paudice", on Via Sandriana, in San Giorgio a Cremano, and wear an all-maroon kit.

Supporting paragraphs: San Giorgio Saint George
Answer: Christianity