Guideline # 3 from Reading the Bible in the 21st Century:
3. “Faith” or “Belief” ≈ Trust and Reliance. The Greek word for faith in the New Testament is usually some variation of ‘pistis’. The verb ‘pisteuo’ is often translated “believe” but did not originally have the heavy connotation of “intellectual assent” or “dogmatic belief” that it does today. Indeed, when getting to know Jesus, it is better to think of faith in terms of “trust” and “reliance” rather than belief, in the modern sense of the word.
“Those who believe in the Son of God have the testimony in their hearts” (I John 5:10).