It's also corroborated by the other Abrahamic texts from what I understand. Let's not just throw out historical sources because of a personal agenda. It's unscientific.
The Pentateuch is a work of mythology. There is strong textual evidence that it's a compilation of many different stories and sources over the course of many years. It was most likely written centuries after the events it purports to describe. It is full of wildly unrealistic claims.