I fail to see how anyone could accept #6 and call himself a Christian. If you can't accept Paul's notion that humanity became tainted with original sin by Adam and that Christ's crucifixion atoned for said sin and allowed for universal salvation, you've rejected the fundamental intellectual premise (and point!) of Christianity.
Or, in other words, Christianity can survive the fall of the Virgin Birth. Christianity cannot survive the fall of the Resurrection.
The doctrine of original sin isn't a major biblical theme. It developed its central role some time after the New Testament was written (particularly at the Council of Carthage in 418) and is much less significant in Eastern Orthodox theology.