What is the difference between "θεὸς" and "ὁ θεὸς"?
"Θεός" means "God", and uses the modern Greek monotonic system."ὁ Θεός" means "the God" and uses the old polytonic system. The "ὁ" is not used any more. In the monotonic system we would write "ο Θεός".
--------------------------------------------------------------------------------------------------------------------------- Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.