The best way to explain Christian beliefs is the famous Nicene Creed, which goes something like this:
We believe in one God, the Father Almighty, the maker of heaven and earth, of things visible and invisible.
...who for us and for our salvation came down from heaven, was incarnate, was made human, was born perfectly of the holy virgin Mary by the Holy Spirit.
By whom He took body, soul, and mind, and everything that is in man, truly and not in semblance.
He suffered, was crucified, was buried, rose again on the third day, ascended into heaven with the same body, and sat at the right hand of the Father.
He is to come with the same body and with the glory of the Father, to judge the living and the dead; of His kingdom there is no end.
We believe in the Holy Spirit, in the uncreated and the perfect; Who spoke through the Law, prophets, and Gospels; Who came down upon the Jordan, preached through the apostles, and lived in the saints.
We believe also in only One, Universal, Apostolic, and one Holy Church; in one baptism in repentance, for the remission, and forgiveness of sins; and in the resurrection of the dead, in the everlasting judgment of souls and bodies, and the Kingdom of Heaven and in the everlasting life.