Are you saying that those who tamper with the Word of God cannot be saved from their sins?
Revelation 22:17-19 says, “And the Spirit and the bride say, Come. And let him that heareth say, Come. And let him that is athirst come. And whosoever will, let him take the water of life freely. For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book: And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book.”
The Lord gives the invitation for all to come, but if a person would corrupt and tamper with God’s precious Word that gives that invitation, then God says that such a person never will repent and have the desire to respond to the invitation of salvation. It is not that people “cannot” respond, but that they “will not” respond. God knows the hearts of man, and He says that such a person will never get saved.