I've come to think that Jesus was a man who saw a lot of problems in the religion of his people, and tried to bring about some reform. The Israelites were at that time a subject people, ruled by officers and magistrates appointed by Rome. They longed to be free of Roman rule, and many hoped for a Messiah to lead them in revolt against Rome.
When Jesus began his preaching work, pointing out the injustices in manner in which his own people worshipped, many saw him as this Messiah, and came to be disappointed when he did not lead them in revolt against Rome.
However, Jesus was not the only person in history viewed as a Messiah by the nation of Israel, there were others before and after him, who drew a number of followers after themselves, and then came to be forgotten. We remember Jesus primarily because a Roman emperor, Constantine, eventually made Christianity the official religion of the Empire, and other religions came to be outlawed.
Regarding the gospel writers, I'm not sure if they believed what they wrote or not, but none of them wrote at the time of the events they describe. The earliest gospel was written around 70 C.E. more than 35 years after Jesus died, the last was written around 100 C.E., more than 65 years after his death. Taken as a whole, the Bible didn't exist in its present form until hundreds of years after the last gospel was written. There were many other gospels used by Christians in the first century, such as the gospel of Thomas. These other documents were excluded when the present selection of books was decided upon in the fourth century.
Miracles are attributed to many people of the ancient world. Most of the miracles attributed to Jesus appear first in the writings of Greeks, Babylonians, and Egyptians hundreds if not thousand of years before the gospels were written. If one chooses to believe those said to be performed by Jesus, then why not (for example) those said to be performed by Isis? She is said to have healed many and even raised the dead. Does a cultural bias cause us to accept one set of legends and reject another? Or do we see these legends as a reflection of the ideals of their authors?
Gaiagirl