John was written in the year 100 or thereafter. His writing is theology. Every word is important.
Not a synoptic Gospel, either, FYI.
“John was written in the year 100 or thereafter.”
And yet his intended audience appears to be Jewish.
He speaks extensively of such concepts as “the children of the wedding tent”, Elijah, Jonah, etc, without attempting to explain to a gentile audience who or what such a tent was, or who Elijah and Jonah were(Would a Roman peasant know this?)
He speaks of the “Sheep” in Jerusalem, meaning, the “sheep gate”, as if the reader would know that already. But if he wrote around 100 AD, that gate would have been destroyed already for 30 years anyway, along with the generation which knew that nickname.
He speaks of the pool of Bethesda, with its columns (same problem as above; if he wrote in 100 AD, it was long gone).
The primary source of danger to believers in his gospel comes from the Judean hierarchy—again, a problem long gone and since replaced by Roman persecution, if he was writing in 100 AD.
“Blood” is sometimes written in the plural, “bloods”, as one would do in Hebrew, but not Greek. And there are several other examples.
That and a great deal more suggests a much earlier period for the writing of at least a first version of John.