Is there a single true Christian?

Ok.
But I googled it and found out that there are ancient manuscripts of it in Spanish and Italian. Where did they come from?
And do you believe that they were amended or were developed by someone else?

 

It really doesn't matter - the bible is the complete word of God.
"I warn everyone who hears the words of the prophecy of this book: If anyone adds anything to them, God will add to him the plagues described in this book.
And if anyone takes words away from this book of prophecy, God will take away from him his share in the tree of life and in the holy city, which are described in this book." (Revelation 22:18)

"And that from a babe thou hast known the sacred writings which are able to make thee wise unto salvation through faith which is in Christ Jesus.
Every scripture inspired of God is also profitable for teaching, for reproof, for correction, for instruction which is in righteousness.
That the man of God may be complete, furnished completely unto every good work." (2 Timothy 3:15-17)

" Where is the wise? where is the scribe? where is the disputer of this world? hath not God made foolish the wisdom of the world?" (1 Corinthians 1:20)

"Now the Holy Spirit tells us clearly that in the last times some will turn away from the true faith; they will follow deceptive spirits and teachings that come from demons." (1 Timothy 4:1