What evidenced do you have that the bible has been altered? Have you done a an investigation?
According to scholars I have read the old testament Bible fails in terms of historical accuracy in many of its stories and the translations sometimes get botched like "Thou shalt not kill" should be "Thou shalt not murder".
Not that I agree with the scholars I mentioned, just letting you know what the arguments agianst Bible accuracy are.
PS: The Egyptians who recorded everything seem to have no record of Moses or the Exodus.