Did the religion of Christianity arise in AD70?

It has been suggested that the religion of Christianity arose as a result of the destruction of the Jewish temple and the Jewish priesthood by the Romans in the year 70. This date marks the inception of the religion and not AD30-33 when Jesus was supposedly crucified. The theological concept of the sacrifice of one man, namely Jesus, to replace the annual Jewish ritual of the Atonement arose at this time and not before because there was no need for the concept prior to this event. Furthermore, it is asserted that the life of Jesus as portrayed in the gospels was invented to explain how the religion arose, but it actually arose as a consequence of the interplay of expectation and traumatic events consistent with normal human behaviour. **What is the evidence for and against this hypothesis?**