Most Christian denominations share some key beliefs, although the interpretation and application of those beliefs may vary dramatically:
*There is a Creator responsible for the existence of all, and that there is a single deity -- one god.
*By definition, "Christian" denominations believe in the divinty of Jesus of Nazareth, as the Christ who served as a sacrifice to redeem a world separated from God.
*Most denominatons believe in an ultimate judgement, and a literal heaven (reward) and hell (punishment). Most believe that the results of that judgement rest on the response to the call of God to believe in, accept the sacrifice of, and follow the teachings of the Christ.
Beyond that, the largest differences are in the methods of expressing those shared beliefs, along with the "rules" of applying them.