stealing, sexual immorality, killing of another human are certainly sins
Stealing is wrong. Society works better when we respect the property rights of others.
What do you mean by sexual immorality? Fidelity within a committed relationship is a good thing. But what about sex for single people? Who says sex between consenting adults is a "sin"? Why?
Killing another human is right or wrong depending on the circumstances.
You need to start to outgrow black-and-white thinking. Ethics are not that simple.
And since you asked, yes the bible is not divinely inspired. It is morally disgusting. You are better than that.