Al Aksa is built on top of the Jewish 2nd temple and 1st Temple remnants and the Arab Muslims know this very well.
That is why they have excavated under the Temple Mount trying (in vain) to erase any signs that the Jews were there LONG before they unfortunately came into existence.
Everybody knows the truth but few have the courage to utter it. The Arab Muslims (and non-Arabs as well) know what happened in history and live in denial in order to deny the Jews what is rightfully theirs.
They are not only is trying to discredit the Jewish people, but also by extension both the Christians and the Bible.