First it is not the responsibility of Maat or anyone else to prove him wrong, it is his responsibility to prove his theory.
Regarding the idea it is quite old hat (read Osman), and now really dull.
As for proving him wrong? That is way easy. Just go to your Bible and read in it the location of where events happened. (I.E., Jerusalem etc.) The geography is not Egypt. The early life of David (hiding in hte desert from Saul, working as a mercenary for the Philistines etc., doesn't exactly fit Thutmose III).
One has to really distort and mangle the Bible to provide "evidence" for this. THis ranks right down there with the totally absurd idea that Jesus = Tutanamun.
Pierre