1. Complete trust or confidence in someone or something: this restores one’s faith in politicians.
2. Strong belief in the doctrines of a religion, based on spiritual apprehension rather than proof.
The New Oxford Dictionary of English.
Atheism UK is solely concerned with religious faith as described in definition 2 above.
Faith is belief without evidence. Particularly in a religious context, it can be belief despite evidence to the contrary. An example of this is faith that God created all life on Earth no more than 6,ooo years ago (Creationism), despite the overwhelming scientific evidence for evolution by natural selection over billions of years.
Evidence can be scientifically investigated, supported or refuted. Faith through religious indoctrination or ‘spiritual apprehension’ does not, by its very nature, provide any credible evidence to investigate.
Religious apologists often use faith as evidence for their theistic claims (sometimes referred to as the ‘argument from faith’). This is meaningless. Faith, by its very nature, provides no evidence whatever and exists solely in the mind of the believer.