Faith is better used as a verb, as in to faithe. That makes the faith in Christ an action word and an ongoing act. If God has all of time as a volume before Him, He knows who professed in Christ, who faithed in Christ’s salvation, faithing in God’s saving Grace. (I have a little essay regarding this on my profile page, for anyone interested in more.)
“A Word study regarding salvation” ... it was originally offered on a Mormonism discussion thread, in response to the LDS notion of ‘salvation after all that you can do’.