Biblical Word of Faith is based on Rom 10:17 God's WORD to you. In the case of salvation, it's Holy Spirit CONVICTION of SIN, and of Judgement.
Simply put: NO conviction = No conversion.
One can say "I Believe" until their head falls off, but without FAITH, it means nothing. As Mark 11:22-24 states, it's HEART BELIEF (FAITH) that's the condition under which "what you say" will become real. And Heart Belief (FAITH) only comes by God's WORD to you.