Third of all, the Torah and the rest of the Tanach are Jewish scriptures, written by Jews for Jews. They were never intended for a non-Jewish audience. They have nothing to do with non-Jews or non-Jewish religions. It is both absurd and offensive for non-Jews to come along and claim to have superior and true interpretations of Jewish text which contradict Jewish interpretations. Especially when the non-Jews in question seldom are even capable of reading the text in the original languages.
Finally, text is designed to be studied and interpreted. That is its purpose. You have still not provided any compelling answer as to why God would prefer we be ignorant than to think and apply our faculty for reasoning and analysis to sacred text.
In general I agree with this assessment, with some very important caveats:
1. The are secular and non-Jewish scholars who are capable of offering interpretations that conflict with Jewish interpretations. I am not here interested in theology, so much I am in textual interpretation, including interpretation that is informed by findings in other academic fields. They are of course subject to the same standards that apply to any scholarship in the field, including peer review. They are not final arbiters in matters theological, which is to say religious meaning, but that is because they are not working within the confines of the tradition, not because their status makes their arguments less probable.
2. I think study and interpretation sometimes requires comparative or outsider perspectives.
But this is very different from what is going on in most (though not all) theological discourse. Religious apologists at major divinity schools are often imposing unifying interpretations in accordance with their confessional obligations. Reformed (Calvinist) theologians in particular are fond of typology, which differs from allegory in very important ways. Namely, it is a foreshadowing technique and is often posed on accounts in the Tanakh to explain later Christian theological developments. They read Christian into Jewish scripture, in a way that closely resembles the more explicit claims of fulfilled prophecy contained in the Christian scriptures.
3. I do believe myself that Christians are not in a position to explain Jewish scriptures, but that is largely because I believe that Christian interpretations are typically typological and force the Christian interpretation onto the Jewish scriptures; it is a basic causality issue. The inverse, however, is simply not true; well-trained Jewish scholars are generally better interpreters of the Christian texts because they are familiar with the interpretive techniques that were being used at the time. That said, the real issue is whether or not you are well trained in the languages and the history of the period, and your level of objectivity.
On the issue of Christian fulfillment of prophecy I am in full agreement. I am not even sure that the earliest passion narratives were meant to reflect history in the sense of actual events, and I think it is probable that the more literal interpretation was more or less reinforced as Christianity and Judaism diverged.
Of course, I also doubt that prophecy is well deployed or accurate in the sense of prediction of future events, but I likewise agree that the prophets clearly served an ethical role that is probably more important for modern religion.