Bertrand Russell: A Presuppositionalist?

"All knowledge, we find, must be built up upon our instinctive beliefs. And if these are rejected, nothing is left." - Bertrand Russell in "The Problems of Philosophy"

Here, along with presuppositional Christian apologists, Russell sees that all thinking ultimately leads back to some more basic unproven assumptions. While obviously there is great disagreement about the details (particularly between Russell, and say, a theist), the basic consensus is that all reasoning is circular (for example: you can't successfully rationalize rationality). And hence, everyone can be taken to some unproven leaps of faith. Even rational people. But sometimes we act or pretend otherwise.