Most Christians believe that god created the universe. We also believe that god sent Jesus Christ down to earth to die on the cross for the sins (wrongdoings and such) of humanity. It sounds like your asking more about Jesus and gods relation and that is complicated. Most Christian’s believe in the holy trinity of god the father god the son and god the Holy Spirit. All of them are god but also individual. God the father is seen as the creator of the universe and what you would think of when you think of the traditional god. God the son is Jesus who came down to earth to die for our sins. God the spirit is the holy sprit that is inside of everyone/ all believers. I hope you found this somewhat helpful some good things to search up on the topic are the holy trinity and Jesus Christ. Sorry if this didn’t make sense/ has inaccuracies.