how do delete faction in the game?

[Stuie]

I beleive you go into Descr_strat and give Macedon's Cities and armies to the rebels, put Macedon into the Unplayble Factions area at the top...that might not be all but its a start.

P.s Welcome to the .org

That's a start. After moving the Macedonian cities to the slave section of the descr_strat.txt file, you should eliminate all remaining references to Macedon in the descr_strat.txt, descr_regions.txt and descr_rebel_factions.txt. Switch them to greek_cities or some other faction that you are keeping. Otherwise you may experience some unexpected CTDs down the road.