sentences:  Christianity has been present in the Italian Peninsula since the 1st century.According to the 2012 "Global Religious Landscape" survey by the Pew Research Center (a think tank in the United States), 83.3% of the country's residents are Christians, 12.4% are irreligious, atheist or agnostic, 3.7% are Muslims and 0.6% adhere to other religions.Other sources give different accounts of Italy's Islamic population, usually around 2%.