What does "it" refer to here?

Context:

Belief in God will always requre a eap of faith. But this synthesis has provided for legions of scientist-believers a satisfing, consistent, enriching perspective that allows both the scientific and spiritual worldviews to coexist happily within us. This perspective makes it possible for the scientist-believer to be intellectually fulfilled and spiritually alive, both worshiping God and using the tools of science to uncover some of the awesome mysteries of His creation.