Oh, oh, oh.
What do you mean that the Gospels were written after the time of Christ? This is not right. This is sacrilege.
Uh. Who actually wrote the Gospels and what language were they written in?
70-100 AD
Who actually wrote the Gospels and what language were they written in?
Unsigned, anonymous. The copy of John 1, the oldest fragment c. 102 AD does not say KATA IOANNEN (According to John). The language was koine Greek of very diverse sophistication. Thus the language of mark is simple and colloquial; the language of john is unlike any of the Apostles, theologically advanced as well.