Although Orthodox churches were historically immigrant communities, the study found that nine out of 10 parishioners are now American-born. Thousands of members had converted to the faith as adults: 29% of Greek Orthodox are converts, as are 51% of the OCA.
'I would not have expected this many,' said Alexei Krindatch, the Orthodox Institute's research director. 'My sense was that in Greek Orthodox, it would be around 15%, and OCA maybe one-third.'
It would be interesting to see how that correlates with the language used in services. I suspect that more OCA parishes use English in their services.