It is stated on fact with the scriptures. Go to my thread on Hebrews-Revelation is not written to the Body of Christ.
They are not evangelistic tracts but talk about how we know God and how we
walk with Him.
Take Peter
In his great mercy he has given us new birth into a living hope through the resurrection of Jesus Christ from the dead
1 Peter 1:3
Now you could take it lots of different ways and say the audience knew of Christ,
but mainly they are converted Jews of the synagogues, who need encouragement
in Christ.
But you want to believe what you do, so you weave meaning into something that
is not there.