A search of the wt library 2010 for the word "faiths" produces 211 hits.
Yet the Bible always refers to "faith" in the singular.
Articles such as "Only One Right Religion" (w55 2/15 pp. 112-116) also reveal that the WBTS believes that "faith" and "religion" (beliefs and practices) are the same thing.
Why then is "religion" not a fruit of the Holy Spirit?
As others have observed "belief" emanates from man, whereas "faith" emanates from God.
A person does not receive the gift of "faith" from the Holy Spirit by choosing to follow the ruling religious clergy class of a particular denomination.
Nor does faith result from doctrinal dissection and interpretations (such as on hellfire, trinity, immortality of the soul, and FDS).
Nor does faith result from rule-making and rule-keeping (apostate legalism according to Ray Franz)
Nor does faith come from trying to adhere to a particular moral code.
Nor does faith come from "special knowledge" on doctrine, morals, and rules.