Facts which prove that ancient Macedonians were Greek people are:

• MACEDONIANS SPOKE A DIALECT OF THE GREEK LANGUAGE
All the monuments and inscriptions found in the Macedonia are written using the Greek language. There is no historic evidence to suggest that the Macedonians were using a different language.
Ancient Macedonian langauge is already put it in the Greek section with the following data
Ancient Macedonian language (provisional ISO-DIS 639-3.5 XMK).
Subgrouping Code : Ancient Greek language or IEGreekB
Group code: Greek Language or IEGreek.

• MACEDONIANS HAD GREEK NAMES
All the ancient Macedonian names mentioned in history or found on tombs are Greek. All the kings of Ancient Macedonia had Greek names. Nobody discovered ancient Macedonian names ending to -ov or -ovski or whatever. Alexander's name is Greek. The word "Alexandros" is produced from the prefix alex(=protector) and the word andros(=man) meaning "he who protects men". The prefix "alex" can be found in many Greek words today (alexiptoto=parachute, alexisfairo=bulletproof - all these words have the meaning of protetion).

Philip's name is also Greek. It is produced from the prefix Philo(=friendly to something) and the word ippos(=horse) meaning the man who is friendly to horses. The prefix "philo" and the word "ippos" are also found in many words of Greek origin today (philosophy,philology, hippodrome,hippocampus).
More for the Macedonian names and theirs etymology in .......Etymology of the 100 most famous ancient Macedonian names

• THE REGIONS OF ANCIENT MACEDONIA HAD GREEK NAMES.
The regions which formed ancient Macedonia had Greek names. Most of these names are used in Greece even today.
more in
http://www.macedonia.com/english/history/regions1.html

• MACEDONIAN ARCHITECTURE WAS SIMILAR TO THE GREEK ARCHITECTURE.
All the buldings found in the Macedonia region have many common characteristics with the ones found in the rest of Greece. Palaces, temples, theaters markets are characteristic sampes of ancient Greek architecture.
more in
http://www.macedonian-heritage.gr/He...a/en/B1.2.html

• MACEDONIANS FOUGHT TOGETHER WITH THE REST OF THE GREEKS.
Macedonians always fought along with the other Greek city-states against enemies from Asia.

• MACEDONIANS TOOK PART IN THE OLYMPIC GAMES.
It is well known then ONLY Greeks were allowed to take part in the ancient Olympic games. You can read the Macedonians that participate in the Games in
http://www.macedoniaontheweb.com/for...pic-games.html

• MACEDONIANS CELEBRATED THE SAME FESTIVALS AS THE REST OF THE GREEKS.
Examples of festivals which were celebrated in Macedonia as well as in other Greek states are the "Hetaireidia", the "Apellaia" and many more.
more in
http://www.macedoniaontheweb.com/for...pic-games.html

• MACEDONIANS WORSHIPED THE SAME GODS AS THE REST OF THE GREEKS.
Several temples dedicated to the Greek Gods have beem discovered in Macedonia and especially in Dion the religious center of ancient Macedonians. It is obvious that the Macedonias worshiped the 12 Olympian Gods as the rest of the Greeks. The Gods were "living" on Mount Olympos which happens to be located in Macedonia. How would that be possible if there was hostility between Macedonians and Greeks? This is another proof that Macedonia was considered a part of Greece.
more in
http://www.macedonian-heritage.gr/HellenicMacedonia/en/B1.3.html