Secular point of view
No evidence has been found that indicates Egypt ever suffered such a demographic and economic catastrophe or that the Sinai desert ever hosted (or could have hosted) these millions of people and their herds.[14] Some scholars have rationalised these numbers into smaller figures, for example reading the Hebrew as "600 families" rather than 600,000 men, but all such solutions raise more problems than they solve.[15] The view of mainstream modern biblical scholarship is that the improbability of the Exodus story originates because it was written not as history, but to demonstrate God's purpose and deeds with his Chosen People, Israel.[16] Thus it seems probable that the 603,550 people delivered from Egypt (according to Numbers 1:46) is not simply a number, but a gematria (a code in which numbers represent letters or words) for bnei yisra'el kol rosh, "the children of Israel, every individual;"[17] while the number 600,000 symbolises the total destruction of the generation of Israel which left Egypt, none of whom lived to see the Promised Land.[18]
Archaeology
A century of research by archaeologists and Egyptologists has found no evidence which can be directly related to the Exodus captivity and the escape and travels through the wilderness,[16] and most archaeologists have abandoned the archaeological investigation of Moses and the Exodus as "a fruitless pursuit".[19] A number of theories have been put forward to account for the origins of the Israelites, and despite differing details they agree on Israel's Canaanite origins.[20] The culture of the earliest Israelite settlements is Canaanite, their cult-objects are those of the Canaanite god El, the pottery remains in the local Canaanite tradition, and the alphabet used is early Canaanite, and almost the sole marker distinguishing the "Israelite" villages from Canaanite sites is an absence of pig bones, although whether even this is an ethnic marker or is due to other factors remains a matter of dispute.[21]
Anachronisms
Several details point to a 1st millennium date for the Book of Exodus: Ezion-Geber, (one of the Stations of the Exodus), for example, dates to a period between the 8th and 6th centuries BC with possible further occupation into the 4th century BC,[22] and those place-names on the Exodus route which have been identified - Goshen, Pithom, Succoth, Ramesses and Kadesh Barnea - point to the geography of the 1st millennium rather than the 2nd.[23] Similarly, Pharaoh's fear that the Israelites might ally themselves with foreign invaders seems unlikely in the context of the late 2nd millennium, when Canaan was part of an Egyptian empire and Egypt faced no enemies in that direction, but does make sense in a 1st millennium context, when Egypt was considerably weaker and faced invasion first from the Persians and later from Seleucid Syria.[24]
Chronology
The chronology of the Exodus story likewise underlines its essentially religious rather than historical nature. The number seven, for example, was sacred to God in Judaism, and so the Israelites arrive at Sinai, where they will meet God, at the beginning of the seventh week after their departure from Egypt,[25] while the erection of the Tabernacle, God's dwelling-place among his people, occurs in the year 2666 after God creates the world, two-thirds of the way through a four thousand year era which culminates in or around the re-dedication of the Second Temple in 164 BCE.[26][27]
http://en.wikipedia.org/wiki/The_Exodus
gdemetz seems to be guilty of leading the witness...