Descartes cannot be interpreted as a ???? to existence if Jewish Thought [which doesn’t hold of our existence] is to be reconciled with it. A variation of that, though, can fit with our Hashkafah. We definitely do believe in Bechirha, however much it is mutually exclusive to the concept of Yediyah. And the world of Bechira is totally summed up by Descartes; I think therefore I am. It actually explains our practical solution to the stirah.
You’re right.