Are you sure it is not the Greeks that are related to Arabs? We could argue this all day long but the truth of the matter is, the bible and Christianity is based on a rather small geographical area that was relatively ignorant of the other populations and religions around the world at that time.
There’s no arguing unless some new evidence has been found. Philistines were invaders from the Mediterranean and were not Semites like Jews and Arabs.
Egyptians and Jews were very familiar with cultures in places like Africa and South Asia, and certainly the cultures around the Mediterranean.