The claim under examination: the one God acted in history, delivered Israel, and entered a covenant at Sinai.
Standard · preponderance of the evidence, not proof
The verdict
That Judaism is an ancient covenant tradition of enormous influence is strongly supported. That God miraculously acted and spoke at Sinai is possible, historically significant, but unestablished by evidence alone. Judaism frames assurance differently, through covenant and mercy, and grants the righteous of all nations a share in the world to come.
If you read nothing else
Judaism is not mainly a system for getting individuals into Heaven; it is the covenant life of a people. Much of its history can be confirmed. Whether God actually spoke at Sinai remains a larger claim than archaeology can settle.