Faith, derived from Latin fides and Old French feid, is confidence or trust in a person, thing, or concept. In the context of religion, one can define faith as "belief in God or in the doctrines or teachings of religion". According to Merriam-Webster's Dictionary, faith has multiple definitions, including "something that is believed especially with strong conviction," "complete trust," "belief and trust in and loyalty to God," as well as "a firm belief in something for which there is no proof".

Religious people often think of faith as confidence based on a perceived degree of warrant, or evidence, while others who are more skeptical of religion tend to think of faith as simply belief without evidence.

The Bible states that "faith is the assurance of things hoped for, the conviction of things not yet seen". (see Hebrews 11:1)