He can't because you're not. You're not going to get anywhere in understanding salvation by faith until you lose the churchianity and denominationalism.
It's Christ, a person, who saves.
God meets us where we are. There's not a person on this planet who can legitimately claim to have an understanding of who God really is. If salvation were dependent on that, no one would make it.
And for the heart of the seeker who truly wants to know God, God will ensure that that person understands who Jesus really is through the illumination of Scripture. If that image or understanding is wrong God will take care of it.
But Jesus did not tell His disciples to hand out Bibles or teach seekers to just say the sinner's prayer for salvation, or any of the multitude of variations on easy believerism that Swindoll teaches is the way to Jesus and salvation.
Jesus established His Church with authority and instructed His disciples in what we are to do to spread His teaching and salvation:
"Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you always, even unto the end of the world."