With what two other religions does christianity share it's early history?

Judaism and Mosaic. The Jew's had followed the laws of Moses though many of the scribes and Pharisees had added to the law or bent the laws to their own will.  The apostle Paul had taken charge in spreading the word of God after Jesus' death to the farther parts of the lands and across the sea to Rome. Later on Christianity was warped by Roman pagan practitioners and adopted as the new Christianity which was later called Roman Catholicism supporting gods of love, luck, war and fertility into holidays they claimed to be christian observances.

the crusades are one of the most significant events in the history of europe and the middle east.   they were a series of religious wars carried out by christian crusaders from europe during the timeframe of the middle ages.   beginning in 1095 ce, the crusades saw european knights and noblemen travel to the middle east in an attempt to capture the holy land away from muslim people that had controlled the region for the previous centuries.   the term crusade means ‘cross’.   therefore, the europeans that became crusaders viewed themselves as ‘taking up the cross’.   in fact, many of the crusaders wore crosses on their clothing and armor as they made their pilgrimage to the holy land.

explanation:

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.