Rev 22:17019 pertains ONLY to thoise who have a share in the Tree of Life - the SAVED.
God can only take away somebody's share in the Tree of Life and in the Holy City if he already HAD a share in it to begin with. This is talking about SAVED people who take away from or add to the words of the words of this Book.
Finally - what makes you believe that you cannot lose your salvation by sinning?
Where the the Bible make this claim?
How is it that it is only the saved that are being addressed here. (Rev. 22:11) says, " He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still; and he that is holy, let him be holy still. "
And, in (Rev. 22:17) the bride and the Spirit give the invitation to salvation. "Let him that is athirst come. And whosoever will, let him take the water of life freely." This is directed to those who are not saved.
Then in (Rev. 22:18-19), the warning is not given to the saved, but to any man or every man who adds or takes away from this book. So you see, it is not the saved being addressed.
Your Bible says 'tree of life'. Mine says 'book of life'. The tree of life doesn't give one eternal life. The book of life doesn't give eternal life. Eternal life is obtained only by faith in Jesus Christ. The believer is already promised that God will not blot his name out of the book of life. (1 John 5:5). (Rev. 3:5)
The believer in Jesus Christ is not going to add or take away from the book of Revelation or any other book.
Stranger