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Good Question. Well that's where the "legal" evidence comes in.

You have the miracles that confirmed Moses as a prophet.
You have the testimony of the nation of Israel that those events occurred.
You even have testimony of other nations about some of those events.
You have antiquities research that keeps confirming the names, places and accounts recorded in Scripture as accurate.
You have prophecies in those works that were fulfilled.
Those prophecies included the Messiah who fulfilled over 160 prophecies.
The Messiah was also confirmed by numerous miracles.
And again you have the testimony of many people, including secular sources.
At least one of those Mosaic prophecies, the return of Israel after a second exile was fulfilled as recently as 1949.

The miracles and prophecies confirm the source as authentic.

There are other confirmation methods as well, but none that I can subject to a "scientific" method.

One method, is that I find the moral code in the Bible to be far superior to any other religion. "To love others" is a far higher calling than the "do no harm" of many religions or the lose all attachment nirvana of some eastern religions.

Judeo-Christianity's call to perfection and it's associated solution to the sin problem and falling short of perfection also makes more sense to me than does say Islam's scales of Justice where if you're 51% good and 49% bad you're okay before a perfect holy God.