What are the key beliefs of Christianity?

Answer #1

The Bible is the book that God wrote to the world though people that loved and followed Him.
" In the beginning God created the heavens and the earth." Genesis 1:1
"God created man in His own image, in the image of God He created him; male and female He created them."Genisis 1:27
Man then sinned and was separated from God, because God is perfect and cannot look at sin
Throughout the Bible God's children have to deal with sin, but God always promised them that He would send a savior and helper
"For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life." John 3:16  

#2

First is the belief in one god, 'God'. Then his son, Jesus, was born in human flesh by a virgin mother. He lived a sinless life and became the pure sacrifice needed to save the world from it's sins so that they could go to heaven and dwell with God. He rose from the dead 3 days later, what we celebrate as Easter, to show his defeat over death and Satan.
Christians believe in a Heavenly Father, in Jesus Christ, and in the Holy Ghost.

God made life, sent his son, Jesus, to earth to be an example for the way people should live. If you believe in him, you are saved.
That there is but one God. That He created the universe and everything in it. That Jesus was the son of God, and the only son of God. That Jesus lived as a man, and that He was crucified and died as penance for the sins of mankind.
1) A belief in God - the maker of everything

2) A belief that Jesus Christ is the son of God, and that he was killed to atone for the sins of mankind.

3) A belief that Jesus Christ rose from the dead and went to heaven and that if you believe in him/God and follow his teachings, you too will be pardoned of your sins and join him in heaven.
4) That God sent his son (Jesus) to die on a cross, which would save our sins.

5) Those who accept Jesus as their savior will go to heaven and live eternally with God and Jesus.

 

#3

The key beliefs of Christianity are summed up by the 'Nicene Creed', the text of which is given below:-

We believe in one God, the Father, the Almighty, maker of heaven and earth, of all that is, seen and unseen.

We believe in one Lord, Jesus Christ, the only Son of God, eternally begotten of the Father, God from God, Light from Light, true God from true God, begotten, not made, of one Being with the Father; through him all things were made.

For us and for our salvation he came down from heaven, was incarnate of the Holy Spirit and the Virgin Mary and became truly human.

For our sake he was crucified under Pontius Pilate; he suffered death and was buried.

On the third day he rose again 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.

We 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 worshiped and glorified, who has spoken through the prophets.

We believe in one holy catholic and apostolic Church.

We acknowledge one baptism for the forgiveness of sins.

We look for the resurrection of the dead, and the life of the world to come.

Amen