Revelation was the final book?

Revelation was the final book?
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To be saved:

Simply believe in the death, burial, and resurrection of Jesus, that he died to pay your sin debt in full. Don’t add a THING!

No religion or church involved.

Now you’re secured for eternity, and rapture ready if you’ll believe that with all your heart.

After the rapture:

Romans 10:13
“For whosoever shall call upon the name of the Lord (Jesus) shall be saved.”

THE GOSPEL OF YOUR SALVATION:

1 Corinthians 15:1-4
15 Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
4 And that he was buried, and that he rose again the third day according to the scriptures:

John 3:16
“For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.”