Peace.
The transmission i.e., the copying of the manuscripts/ scrolls in the original languages over the
centuries have been remarkably accurate.
You need to be aware of the errors in translating however. Please see a few.
1 John 5:7-8 (Good News Translation)
7 There are three witnesses:8 the Spirit, the water, and the blood; and all three give the same testimony.
1 John 5:7-8 (King James Version)
7For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
8And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one.
1 John 5:7-8 (New International Version, ©2011)
7 For there are three that testify: 8 the[a] Spirit, the water and the blood; and the three are in agreement.
Footnotes:
a. 1 John 5:8 Late manuscripts of the Vulgate testify in heaven: the Father, the Word and the Holy Spirit, and these three are one. And there are three that testify on earth: the (not found in any Greek manuscript before the fourteenth century)
1 John 5:7-8 (New Living Translation)
7 So we have these three witnesses[a]—8 the Spirit, the water, and the blood—and all three agree.
Footnotes:
a. 1 John 5:7 A few very late manuscripts add in heaven—the Father, the Word, and the Holy Spirit, and these three are one. And we have three witnesses on earth.
Revelation 1:11 (Good News Translation)
11 It said,
Write down what you see, and send the book to the churches in these seven cities: Ephesus, Smyrna, Pergamum, Thyatira, Sardis, Philadelphia, and Laodicea.
Revelation 1:11 (King James Version)
11Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamos, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea.
Revelation 1:11 (American Standard Version)
11 saying, What thou seest, write in a book and send it to the seven churches: unto Ephesus, and unto Smyrna, and unto Pergamum, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea.
1 Timothy 3:16 (New Living Translation)
16 Without question, this is the great mystery of our faith[a]:
Christ[b] was revealed in a human body
and vindicated by the Spirit.[c]
He was seen by angels
and announced to the nations.
He was believed in throughout the world
and taken to heaven in glory.
Footnotes:
a. 1 Timothy 3:16 Or of godliness.
b. 1 Timothy 3:16 Greek He who; other manuscripts read God.
c. 1 Timothy 3:16 Or in his spirit.