Anyways, god couldn't create a human without sin and you expect me to believe that He's going to punish people because they now have sin?
Wrong angle. Let's try this: What is the purpose for teaching a gun safety class?
The purpose is not to assure people that if someone gets shot they're safe because someone will get them medical care.
When Jesus came to save us from sin, he meant just that. He came to teach us how to avoid sin so that sin doesn't damage/enslave us. Just as a gun safety class isn't meant to keep us safe after the bullets hit, neither is the crucifixion meant to keep us safe after sins hit. It is meant for us to use to avoid sin before we ever succumb to sin. Jesus taught a way of life. As a man, he lived a life of avoiding sin by being ever obedient to the will of the Father. He told us to follow him in this because he is the way, the truth, the life.
Sure, you can take modern English, and reuse English from five hundred years ago, to propose the ridiculous idea that Jesus death was mean to save us from punishment for sinning. Forget that. Jesus' death was to save us, not from punishment, but from the actual bullets of sin--when we follow in his ways.
You want saved from sin? Follow Jesus. Closely. You will live a redeemed life and one where you turn away from sin because Jesus' way, your way, is now obedience to the Father. When you fail? Repent, turn back, and all is forgiven. It will be remembered no more.