Plagiarizing means taking credit for someone else's work. So yes, you can plagiarize facts.
Word games.
You have plagiarized the intellectual accomplishment by taking credit for the feat (finding/discerning/describing the facts). The facts were there all along regardless and can never be owned by anyone. It is the intellectual feat, not the facts themselves, that has been plagiarized.
As for the gospels, there is plenty of academic feeling that Mark and Luke were built upon Matthew and that John was built upon the other three with the last three books emphasizing and embellishing different aspects of the story and, especially in the case of John, different goals to achieve in the writing. There is still, however, not sufficient evidence to make this a firm conclusion. But, since it seems quite clear that none of the gospels as they appear today were written by, or solely by, their purported authors then the whole thing appears to be plagiarism layered upon plagiarism.
Edited by AZPaul3, : spelin