Is that correct that arabs arrived as conquerers in palestine 600 years ago?

What I said was, "the first Arabs arrived there from the Arabian Peninsula, as conquerors btw, about 600-700 years after Christ."

That would make it about 13-1400 years ago.

As to where are the ancient Philistines, the ancient Egyptians, as well as the ancient Babylonians, the 10 Lost Tribes of Israel, etc., they are simply lost to history.

The area of ancient Babylon is now called Iraq. Both Iraq and modern day Egypt are Arab countries.

Of course, these few words in an Internet forum are very simplistic. The whole story is very complicated. Many scholars have devoted lifetimes to it. Undoubtably, many more will in the years, centuries, to come.