Why was christianity so appealing to the people of the roman empire

Christianity offered hope to people who wondered about the meaning of life in a harsh world.  It spoke of redemption and salvation that allowed people to endure hardship and suffering.  Those were some aspects of the Christian message's appeal.

Perhaps, though, the biggest factor that convinced people in the Roman Empire of the value of Christianity was the way that Christians showed strength and character when they were being persecuted for their faith.  During the reign of Emperor Nero, Christians were persecuted heavily in Rome in the 60s AD. During the reign of Emperor Domitian in the 90s AD, there were further persecutions.  The bravery of Christians enduring persecutions made an impression on people, seeing them more as victims than as enemies of the state.

the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.