The literal problems with the bible in general and the story of Moses in particular has nothing to do with the number of slaves he saved or the accurate accounts in the bible of people places and events. It has to do with the claimed miracles God preformed, the story claims he parted the red sea, rescuing slaves is entirely possible but the claim of parting the red sea and other miracles is where the story runs into trouble. The bible has many accurate descriptions of events, cities and and even individual people, morality plays based on the morals of that time and place. But this does not mean it is a message from god nor does it show any evidence of the existence of god or the over all truth of the story of the bible.
I could write a book about aliens invading New York City, I could use the names of real people and real places describe real events, I could describe the moral choices the people of that city would have to make and the results of those choices, slanted to my own sense of morality and much of it would be accurate, I could describe many miraculous things the aliens could do but the premise of the book, alien invasion would be false. The fact that the bible contains accuracies doesn't mean it is true or that God is real, it is just a work of fiction used by the priest class to gain control over their people, to suggest it is something more requires evidence you have thus far been unable to provide in even a tiny amount....