I understand that we are forgiven for our sins, but the OSAS doctrine that is so widely taught is frankly confusing when Christ Himself stated that He would blot our names from the Book of Life if we were to change the teaching of The Revelation (not verbatim). This statement from Christ tells me that He can blot our names from the Book of Life, so why should we believe the OSAS doctrine?
Jesus never made such a statement. In fact the only place in the Revelation where He mentioned the Book of Life is Rev. 3:5 where He said, “He who overcomes will, like them, be dressed in white. I will never blot his name out from the book of life but will acknowledge his name before my Father and His angels.” In the context of the letter He was saying that everyone who remembered the gospel and obeyed it would be dressed in white and his name would never be blotted out of the book of life. He was promising eternal security to everyone who believes the gospel, just like He did in John 3:16, John 6: 38-40 and John 10:27-30.
It was John who threatened that if anyone took anything away from the prophecies of the Book of Revelation God would take away his part in the Book of Life (Rev. 22:18-19). With all the testimony of the New Testament that promises Eternal Security to believers, this can only mean that those to try to change the Book of Revelation are proving by their actions that they are not and never were saved.