When was Christianity established?

The establishment of Christianity cannot be pinpointed to a single event or date, as it evolved gradually over several centuries. The origins of Christianity can be traced back to the teachings and life of Jesus of Nazareth in the 1st century CE. After Jesus' death and resurrection, his followers spread his message throughout the Roman Empire. Over time, Christianity gained a foothold in different parts of the empire and eventually became the dominant religion in the 4th century CE, when the Roman emperor Constantine converted to Christianity and made it the official religion of the Roman Empire.