Starved of money as the state makes huge spending cuts, the deeply conservative church which grew from one of the earliest centers of Christianity is seeking new sources of funds.
But despite a new spirit of enterprise, such as at one monastery which wants to build a solar energy farm, numbers of priests are dwindling, those that remain are suffering pay cuts, and the church is fighting to keep soup kitchens open as unemployment soars and poverty deepens.
"The tills are empty and the system is collapsing," said Ignatios Stavropoulos, a modernizing priest who has his own page on LinkedIn, a social website for professionals.
Under a 60-year-old treaty, the state agreed to pay priests' salaries in exchange for large amount of church property, including land. But this means more than 10,000 priests are now on the government payroll, putting a 190 million euro ($250 million) annual burden on the country's overstretched budget.