What about Romans 10:17 and the whole context of the need of preachers being sent even though I disagree that the context that you mentioned is the grace that is a gift and even more so the salvation mentioned which is the key topic here and not so much the faith (Ephesians 2:8) even though God has made available what he believes to mankind in his word and it's up to us to believe his word or not believe it but he's always there to help us of course even once we're saved he's always there to help us and that's why he's called the helper among many other things. Salvation is a gift from God to fallen mankind made available through his grace received by our faith.