How are Christians saved by faith alone in Christ Alone?

"It is to be remembered that efficacy of faith does not reside in itself. Faith is not something that merits the favour of God. All the efficacy unto salvation resides in the Saviour. As one has aptly and truly stated the case, it is not faith that saves but faith in Jesus Christ; strictly speaking, it is not even faith in Christ that saves but Christ that saves through h faith… The specific character of faith is that it looks away from itself and finds its whole interest and object in Christ. He is the absorbing preoccupation of faith." - John Murray