The axioms (Existence, Identity, and Consciousness) are not taken on faith. They can't be disproved because any attempt to disprove them is a contradiction. By this I mean that the only way to disprove them is by using them. It is the idea of the "stolen concept" that Rand sometimes referred too. Any attempt to disprove the axioms illustrates why they exist and why any attempt to prove or disprove them is futile. They are hardly issues of faith.