Jesus probably popularized the concepts of mercy, repentance and forgiveness which resonated with a very large number of people throughout history. Love your enemies, pray for those who persecute you are his signature teachings. Jesus may have been a real person but it's hard to tell. Those themes that Jesus taught had a very profound impact.
I'm convinced Jesus is mostly mythological even if he was a real person. However the Bible was written to be taken literally, and as literal history.
I think it's apart of human nature for many to feel that people are not faultless, and that sin is a human condition. For me I think all humans are seriously fallible and not everyone is sinful. Certainly good and evil throughout history has been at work.
I think science and democracy have done way more for humanity then Jesus. Whatever way a person looks at it, Jesus had a profound impact on many, many people. In some ways it was okay, but not all. Religion is an important lesson in the evolution of humanity. I would not be one to take any of it as absolute truth. There's no evidence for a supernatural resurrection. It's good for me to dismiss Jesus as truth, but the themes of Jesus' teachings are very important.
Personally I think humanity should embrace the fact of our error prone fallibility. Through trial and error with a total commitment to discovering truth in virtue humanity can learn well beyond what Jesus taught. The Greeks had a major positive impact on humanity moreso than Jesus. There's a lot to learn from the Bible some of it good, and a lot of it bad, all of it is human perception.