What perccentage of greeks practice greek orthodox (a religion)

The answer is 98%

The Greek population does not only "practice" Greek Orthodox, they live and abide by that, since that is their religion. The percentage of Greeks who use Greek Orthodox is 98%.

- I.A. -

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.