Zzyzx wrote:
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Perhaps a brave Apologist will step forward and offer a definition of Christianity that is acceptable to Christendom?
That may be more than what can be covered in this format. Richard Baxter wrote a great deal on the topic. C.S. Lewis’ most influential work,
Mere Christianity, covers that topic.
I understand that on this site we define a Christians as someone who says they are a Christian.
As always, I can speak only for orthodox Christianity (Eastern Orthodox, Roman Catholic, and Protestant Christians). In terms of beliefs, an orthodox Christians is someone who believes the following:
I believe in God, the Father almighty, creator of heaven and earth. I believe in Jesus Christ, his only Son, Our Lord. He was conceived by the power of the Holy Spirit and born of the Virgin Mary. He suffered under Pontius Pilate, was crucified, died, and was buried. He descended to the dead. On the third day he rose again. He ascended into heaven, and is seated at the right hand of the Father. He will come again to judge the living and the dead. I believe in the Holy Spirit, the holy catholic Church, the communion of saints, the forgiveness of sins, the resurrection of the body, and the life everlasting.
And:
I believe in one God, the Father almighty, maker of heaven and earth, of all things visible and invisible. I believe in one Lord Jesus Christ, the Only Begotten Son of God, born of the Father before all ages. God from God, Light from Light, true God from true God, begotten, not made, consubstantial with the Father; through him all things were made. For us men and for our salvation he came down from heaven, and by the Holy Spirit was incarnate of the Virgin Mary, and became man. For our sake he was crucified under Pontius Pilate, he suffered death and was buried, and rose again on the third day in accordance with the Scriptures. He ascended into heaven and is seated at the right hand of the Father. He will come again in glory to judge the living and the dead and his kingdom will have no end. I believe in the Holy Spirit, the Lord, the giver of life, who proceeds from the Father and the Son, who with the Father and the Son is adored and glorified, who has spoken through the prophets. I believe in one, holy, catholic and apostolic Church. I confess one Baptism for the forgiveness of sins and I look forward to the resurrection of the dead and the life of the world to come.
Understand that you might believe. Believe that you might understand. –Augustine of Hippo