Answer:
Some of the main themes that Jesus taught, which Christians later embraced, include:
Love God.
Love your neighbor as yourself.
Forgive others who have wronged you.
Love your enemies.
Ask God for forgiveness of your sins.
Jesus is the Messiah and was given the authority to forgive others.
Repentance of sins is essential.
Personally, I am like a half believer-ish person... I feel like God and etc. are there, but not for me so I don't know but I'm just helping people on this site!