As a practical counterpoint to the title and OP, is anyone seriously claiming that a person feeling crushed under the weight of despair, cannot check into a motel room, read the Gideon's Bible found in every room, and discover Jesus Christ, God the Father and ... "confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead" [Rom 10:9] and be saved?
Is such an event really IMPOSSIBLE for God without a human being to act as a verbal intermediary?
That is what the OP claims ... there is NO SALVATION without the HUMAN element.
I do not believe that is true.
But God, being rich in mercy, because of His great love with which He loved us, 5 even when we were dead in our transgressions, made us alive together with Christ (by grace you have been saved), 6 and raised us up with Him, and seated us with Him in the heavenly [places] in Christ Jesus, 7 so that in the ages to come He might show the surpassing riches of His grace in kindness toward us in Christ Jesus. 8 For by grace you have been saved through faith; and that not of yourselves, [it is] the gift of God; 9 not as a result of works, so that no one may boast. 10 For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand so that we would walk in them. [Ephesians 2:4-10 NASB]
It is ALL ABOUT GOD, not about our helping God.
Sola fide ("by faith alone").
Sola gratia ("by grace alone").
Solo Christo ("through Christ alone").
Soli Deo gloria ("glory to God alone").