Both philosophical and historical. Maybe the Hebrew Bible (Tanakh) isn’t reliable? How do I verify Judaism at all?

Great question. Do you want an answer in one sentence, or can it also be in three?

With God's help, 8 Cheshvan 5783, on the night after the elections to the 25th Knesset

The Hebrew Bible (Tanakh) foretells for the Jewish people an exile after which they would return from all corners of the world to their land, contrary to any historical precedent. And so it was. We survived after thousands of years of exile and persecution, in which we were like "a lamb among seventy wolves," went through the terrible Holocaust, yet returned to our land, and now live here in freedom, sovereignty, and economic, cultural, political, and security prosperity. And despite sharp disagreements that rise to "high tones" – we maintain an exemplary democratic election system. "Who is wise and will observe these, and they will contemplate the kindnesses of the Lord."

With blessings,
Amiyoz Yaron Schnitzler, may his lamp shine

Even from a religious standpoint, we are experiencing a growing strengthening of the religious and believing public. The religious parties alone are expected to have more than thirty Knesset members, and in the other parties too there are many Knesset members who are observant, on the right, in the center, and on the left – in total well over 40 observant Knesset members, not to mention the traditionalists. Even Meretz activists reacted with shock to the deed of one of their own and went to put on tefillin at Chabad stands. Which is to say: even those who appear "left-wing and secular" know how to respect the tradition of their people.