How so, when it was written by a bunch of people who had never even met Jesus?
How do you know this? Yours is only speculation. Nobody can prove that the Gospels were not written by people who met Jesus and witnessed first hand all of his miracles, people who saw him with their own eyes after he rose again.
We know that the gospels were written before 70 AD, within only 40 years of Jesus' crucifixion. We know that the gospel according to John was written by John. He met Jesus, witnessed all of his miracles and saw him with his own eyes after he rose again. Who is to say that the witting of the gospels did not start immediately after Jesus' resurrection, but wasn't completed until a decade later? All we have today are copies that we know may or may not have been "copied" 10, 30, 40 years later. If we find a copy today that was "copied" in 300 AD, that does not mean that the gospels were written in 300 AD.
Here is a conspiracy theory: Because the Bible contradicts a lot of the The Roman Catholic Church teachings, around 400 AD the Catholic church outlawed the reading of the Bible by anyone who wasn't a church leader. The Bible was translated from the Hebrew and Creek languages into Latin, and many of the Bibles that were not in Latin at that time were destroyed or hidden by the church. Either the Catholic church has the original gospels today, or they simply destroyed them at that time.
I choose to accept by faith that the gospels are true, and by personal experience, they are true. What you believe, given the evidence or lack there of on both sides is your choice.