There are times where two people speak the same language, use the same words, and mean very different things by the same words. In conversations between Christians and atheists, “faith” is one such word. For many atheists, the word “faith” means, by default, belief without evidence or even belief against the evidence. In contrast, I doubt many Christians would accept that definition. For example, according to the NIV translation, Hebrews 11:1 states, “Now faith is confidence in what we hope for and assurance about what we do not see.”
Victor Reppert, at Dangerous Idea, writes this about the word “faith.”
Every time you use the word “faith” in a discussion with an atheist, they are going to declare victory. They will presume that you are believing for no reason, and that you are are admitting that the evidence is against you.