What does "which" refer to here?

What does "which" refer to here? (1) or (2)
(1) "Which" refers to "faith".
(2) "Which" refers to the previous sentence -"The only demons we must fear are those that lurk inside every human mind: ignorance, hatred, greed, and faith".

Context:

Finally, Harris turns to spirituality, where he especially takes his inspiration from the practices of Eastern religion. He writes that there have been mystics in the west and calls some of these "extraordinary men and women", such as Meister Eckhart, Saint John of the Cross, Saint Teresa of Avila, Saint Seraphim of Sarov, but that, as far as Western spirituality is concerned, "we appear to have been standing on the shoulders of dwarfs." He discusses the nature of consciousness, and how our sense of "self" can be made to vanish by employing the techniques of meditation. Harris quotes from Eastern mystics such as Padmasambhava and Nisargadatta Maharaj, but he does not admit any supernatural element into his argument – "mysticism is a rational enterprise," he contends, "religion is not." He later elaborates: "The mystic has reasons for what he believes, and these reasons are empirical." He states that it is possible for one's experience of the world to be "radically transformed", but that we must speak about the possibility in "rational terms".

“ The only angels we need invoke are those of our better nature: reason, honesty, and love. The only demons we must fear are those that lurk inside every human mind: ignorance, hatred, greed, and faith, which is surely the devil's masterpiece.

More:
https://en.wikipedia.org/wiki/The_End_of_Faith#Reception