From the home page.
>> For almost two thousand years, the Christian Church has taught that Jesus was crucified, died, and was resurrected three days later. This has long been one of the church's foundational beliefs, along with the virgin birth, atonement, and future second coming of Jesus.
In the year 325 CE, Constantine (a non-baptized Pagan) convened the Council of Nicea to settle disputes in the Church. The council changed Jesus from man to God in the flesh, they changed the Sabbath from Saturday to Sunday, and the Passover was changed to Easter.
Here are some resources that go about answering this. After all, no need for me to reinvent the wheel. XD