I believe the one church is made of seven generalized congregations with many scriptural interpretations...
1. Ephesus - Messianic - Challenging post interpretations - In which they have a right to do!
2. Smyrna - Oriental Orthodox - The Book of Enoch was a long time in the hands of Ethiopians
3. Pergamos - Greek Orthodox - The Septuagint
4. Thyatira - Catholic - Originally the Latin Nova Vulgata
5. Sardis - Protestant - Many versions translated from previous versions
6. Philadelphia - Wesleyan - Many versions translated from previous versions
7. Laodicean - Word of Faith - Many versions translated from previous versions
Seven candlesticks - Seven generalized congregation - All unique one to another
Seven seals - Those names written in the Lambs Book of Life
Seven stars - Those messengers to the congregations
So... Who is saved? Who are the good Catholics? Who are the right Protestants? Who are the revived Philadelphians? Who in Laodicea took their materialism too far? Who are the good wheat? Who are the unsaved tares?
Regarding the Lamb's Book of Life... Sealed with seven seals...
3 And no man in heaven, nor in earth, neither under the earth, was able to open the book, neither to look thereon.
4 And I wept much, because no man was found worthy to open and to read the book, neither to look thereon.
5 And one of the elders saith unto me, Weep not: behold, the Lion of the tribe of Judah, the Root of David, hath prevailed to open the book, and to loose the seven seals thereof. - Revelation 5
The answer is... We do not know! We are not worthy to open the Lamb's Book of Life to see who is where! All we can do is...
6 But the righteousness which is of faith speaketh on this wise, Say not in thine heart, Who shall ascend into heaven? (that is, to bring Christ down from above:)
7 Or, Who shall descend into the deep? (that is, to bring up Christ again from the dead.)
8 But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach;
9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
10 For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
11 For the scripture saith, Whosoever believeth on him shall not be ashamed.
12 For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him.
13 For whosoever shall call upon the name of the Lord shall be saved. - Romans 10
All we can do is call on the name of the Lord and believe that we are saved!