>>this will have to be something that ALL christian sects believe
1. Jesus Christ was born, lived, died, raised from the dead and ascended into heaven.
2. The goodhood consists of three members: God the Father, God the Son and God the Holy Ghost (AKA the trienity of the goodhood).
3. The only way to get to heaven is thru Jesus Christ.
4. We are all sinners and require God's forgiveness to get to heaven.
Those I think are the basic principals of Christianity that all denominations will agree with. From there beliefs diverse significantly, for example I don't believe in the literal interpretation of the Bible. The earth is certainly much older than the 6,000 years many Christians believe it to be. And the earth was not created in 6 earth days but 6 of God's days, which could be millions of earth years.
This is true.