If Moses could not write how could he write the Pentateuch?

Answer 1

The problem with this assumption is that it ignores the clear findings of Archaeology which demonstrated that writing existed for centuries before the time of Abraham. Thus it is possible not only for Moses to have written the Pentateuch but for Abraham to have authored part of it as well, with Moses being the final editor.

Julius Wellhausen, one of the chief formulators of the Documentary Hypothesis stated:

"Ancient Israel was certainly not without God-given bases for the ordering of human life; only they were not fixed in writing." (Wellhausen, Prolegomena to the History of Israel. Translated by Black and Menzies. Edinburgh:Adam & Charles Black, 1885, p.393.

In 1893 Schultz another documentarian stated in his work Old Testament Theology:

"Of the legendary character of the pre-mosaic narrators, the time of which they treat is a sufficient proof. It was a time prior to all knowledge of writing, a time separated by an interval of more than four hundred years, of which there is absolutely no history....And even when writing came into use, in the time, that is, between Moses and David, it would be but sparingly used, and much that happenned to the people must still have been handed down simply as legend."

Herrmann Schultz. Old Testament Theology. Translated from the fourth edition by H. A. Patterson. Edinburgh:T&T Clark, 1898. p.25-26.

Archaelogical discoveries have confirmed that writing was in fact well known in borth Palestine and Syria throughout the age of the Patriarchs, over 500 years before Moses. The excavations at Ugarit revealed a high degree of literary culture with even a dictionary in four languages and well developed prose and poetry.

Summary:

It is quite clear from the discoveries of archaeology that writing existed and was widely used for a considerable period before Moses. This is well understood and therefore the conclusion is that the assumption that Moses could not have written the Penteateuch because he could not have had the art of writing is patently false.

Answer 2

The greatest reason is that books in the ancient world are not named for their author. They are named for their subject. For example, the "Book of Moses" is a book about Moses, not a book by Moses. Of course, the book might have been written by him as is commonly assumed, but this is stretching the limits of logic. Moses could not write about events after his death as the last book say, it is more rational to believe that an un-named compiler collected the works of Moses and placed Moses' name upon the work. This is not dishonest, it is just a fact of the ancient literary world.