Dr. Detering has explained that Joshua replaced Moses in the role of crosser from the Egypt. So the Celsus's Jew euhemerized this mythical Joshua in a banal magician coming from the Egypt.
And the mythicist Thomas Whittaker wrote:
(extract from The Origins of Christianity, 1904, my emphasis and bold)A particular confirmation of Mr. Robertson's view to which I desire to draw attention
is an older reading in the Epistle of Jude (recognised in the margin of the Revised Version).
It occurs in verse 5, and its significance is brought out by verse 6. "I will therefore put you in remembrance, though ye once knew this, how that Jesus [that is, Joshua, instead of' the Lord'] having saved the people out of the land of Egypt the second time [Moses having saved them the first time] afterward destroyed them that believed not." The next verse proceeds: ''And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under
darkness unto the judgment of the great day." Plainly the binding of erring angels can
only be attributed to a supernatural being, and not to a mere national hero. And it must be
remembered that the Epistle is a Judeo-Christian, not a ''heathen Christian", work.
With this passage from a book of the New Testament, it is interesting to compare a
Messianic prophecy from the Sibylline Oracles, translated by the Rev. W. J. Deane as
follows : "Now a certain excellent man shall come again from heaven, who spread forth
his hands upon the very fruitful tree, the best of the Hebrews, who once made the sun
stand still, speaking with beauteous words and pure lips." Here, as Mr. Robertson would
say, we observe the conception passing into that of the Teaching God.
How you can see, there is no doubt that who saved the people the second time is not Moses, but his successor, Joshua.
(Book of Joshua 1:1-5)1 After the death of Moses the servant of the Lord, the Lord said to Joshua son of Nun, Moses’ aide: 2 “Moses my servant is dead. Now then, you and all these people, get ready to cross the Jordan River into the land I am about to give to them—to the Israelites. 3 I will give you every place where you set your foot, as I promised Moses. 4 Your territory will extend from the desert to Lebanon, and from the great river, the Euphrates—all the Hittite country—to the Mediterranean Sea in the west. 5 No one will be able to stand against you all the days of your life. As I was with Moses, so I will be with you; I will never leave you nor forsake you.