Christ rejects the Mosaic code "an eye for an eye"
Christ rejects the Jewish "Law", particularly the dietary restrictions (it is more important what comes out of the mouth than what goes in)
I don't think we can assume anything about the life of Christ that isn't in the gospels and even that is suspect, since the gospels were written years, possibly many decades after his death.
I disagree that any of the parables are that clear and in many cases, they make no sense. From the prodigal son, we learn that you are better off squandering your fortune and life, and then repenting, than you would be if you lead a good life from the beginning. The story of the talents teaches us that we are better off in high risk adventures with other people's money, and will be punished for playing it safe with the property of others. The date tree is made to whither because it doesn't bear dates in season. In terms of wisdom, Chinese philosophy makes much more sense.
The gospels are full of mythical propaganda... the evangelists who believed Christ was the jewish messiah conveniently have Jesus, a Nazarene, born in Bethlehem because the messiah had to be to the house of David. Those who believed he was the Son of God, like John, don't mention his birth at all, since his origins on earth were of no consequence. Furthermore, we are to believe that an immense hubbub arose at the time of Christ birth, the choir of angels, the star, the Magi... yet, a mere thirty years later, not one person seems to recall this? Oh yeah, I remember you, the star and all...in fact, Herod killed my brother looking for you! Somehow, the slaughter of the innocents was quickly forgotten.
Despite his alleged notoriety, Christ is barely mentioned in Roman versions of events, likely because such figures arose frequently at the time and were often eliminated for the same reasons Christ was. Once again, if one looks objectively at what we know, the Romans concern that Christ was seeking political power is not unwarranted. The rhetoric is very similar to revolutionary rhethoric of the 20th century (the meek shall inherit the earth, wealth isn't important). despite being Saviour for all men, Christ clearly has disdain for Roman authority and his cryptic answers to Pilate are more sarcastic than humorous. mainstream Jews had no use for an aramaic Che Guevera either, given a) the Romans allowed them to practice their religion and were generally benign occupiers, and b) the Romans dealt with disruption of their empire severely.
Christ's teachings are often belligerent and, in the temple, he even resorts to violence. He deliberately antagonizes those he disagrees with, rather than instruct them.
HOWEVER, these flaws reflect the human portrayal of an epic figure. If we look at the big picture, Christianity as a philosophy that has evolved over the centuries has been the most beneficial to human progress and happiness. Given the oppressive nature of some other paradigms, it will be apparent that Christ indeed did save humankind, but in a way far more complex and interesting than conventional Biblical mythologies suggest.