What are the 3 Major Christian Beliefs and how do they affect the life of a Christian?

The first major christian belief is that Jesus, God the father, and god the holy spirit are the same people and so god sent his only son to die on the cross for our sins so that we can go to heaven, and this affects us because first the holy spirit is still active in healing and in other things and that Christians want to have a close relationship with god. The second major belief is that you need to except Jesus as your lord and savior so you can go to heaven or else you will go to hell!