"Personally, I want an evidence-based theology and spirituality." (socratus)

Isn't there something in the Bible or somewhere about belief being the foundation of true faith? Read St John, Ch 20, Verse 29- where Thomas gets told by Jesus that he needs to believe without verification. Lack of belief means there can be no god, and if you can't believe without proof than you are an unbeliever-- or, from what I have seen here, likely to be a scientist.