Your theology is seriously flawed friend. If original sin is not real, did God just make it up? Did God just one day say - I have decided that man has fallen and will be sinful from now on, and I will make up this fake story to support it? Did God just on a whim decide to make people with "innate sin natures" or as Paul the Apostle said, do we get them from Adam? (REad romans 5:12)
Why did Paul believe Adam was real and that original sin was real? I think you need to get on your knees and ask God to show you the Truth - then you should pick up your bible and allow the Holy Spirit to teach you.
But to the person who says that they read Genesis and decide that Mankind is fallen because of mankind's own choices (same as I stated earlier). I say they are exactly correct.
In sum, if you proffess to be a Christian, ie saved by Christ in the most literal sense of the meaning, it is my opinion, and I think Scripture and simple reasoning back me up here, that in order to accept salvation and Jesus, you must accept original sin coming ffrom the first humans. This game of lets play cut and paste with the Scriptures is absurb. How am I to discern what is truth and what is not? Is salvation truth? How can you prove it is and other portions are not? Do you merely discount supernatural accounts? Do you stick only to the parts you like?