I have posted previously about the so-called "Kuzari proof" for Judaism. Last week the blog Kefirah of the week (btw highly recommended!) has done a post on the topic which in addition to the usual refutations (how many people were there, no archeological evidence, other revelation stories exist) brings a new aspect: Sinai is never discussed by the prophets!
I’ll let him make his own argument (heavily shortened, go to the original post to read the whole thing):
[…] we can instead look at what the Kuzari argument’s positive claims are, things that would have to be true for the very premises to make any sense. These are: 1. The Sinai revelation story was known to every generation from the original event until the modern day. 2. The Sinai revelation was considered “foundational” for every generation until the modern day. […]
I think looking at the prophets is a good approach because they’re the best witness to the Israelite culture in the latter half of the first temple period and the exile. They are attempting to persuade the Israelites to worship God properly, and in doing so, they use everything at their disposal. […]
So, the question is, what do the prophets say about Sinai? The answer is, nothing. They don’t even mention the word. […]
What to make of this? Here are some options. Neither the prophets nor the people knew about the Sinai revelation. In this case assumption 1 above is false and the Kuzari argument falls. Another option: the prophets knew about the Sinai revelation but the people didn’t, in which case both 1 and 2 are false and Kuzari falls. How about: the prophets knew about it, but didn’t think it was important, in which case assumption 2 is false, the revelation just wasn’t all that important and Kuzari falls. […]
I’ll repeat myself. The Kuzari is not a "proof", not even a convincing argument for believing that Judaism is true. No one should use it for kiruv (to bring Jews back to Judaism). If someone builds his/her faith on something this shaky, how much is that faith worth? Let people appreciate the beauty of Judaism and of G-d, build a connection and then they can decide for themselves to believe.