How do we know when the Gospels were written?

As a believer in God and Jesus (a prophet of God) I feel that the question that is always avoided, is, What is the true reason MAN created Christianity, and created Jesus into a God instead of a prophet? Why is it that Jesus never claimed to be God, in fact clearly stated that he was not, and never claimed to be a human incarnation of God. History and science can prove the existence of Jesus. There are many resources online & offline to support the reality of Jesus and all of the proclaimed prophets before Him. But nothing, especially nothing scientific, can support the existence of Jesus as a God, or the "miracles" that he completed. I believe that these acts of Jesus were manipulated by people throughout the times who once created a story and then had to continue to build upon the fibs so as not to be exposed as untruthful. Nothing in this text is intended to defame God or Jesus the prophet, or any other prophets, but open my widely supported view to this forum. Thank you Edited by AdminPD, : Off Topic Warning