1)  The 'myth' of Original Sin basically came into vogue with Augustine's writings.  The Creation story did not actually happen as it is written in Genesis.  And neither did Original Sin.  The official church knows this as well.  But it won't stop teaching about Original Sin, because it would have to admit that it was WRONG.
2)  Before we actually KNEW how the world and humanity really was created, the church could not be blamed for teaching what Augustine taught.  BUT---it is high time to admit that Original Sin is also a myth.  The church has already stated that LIMBO doesn't exist.  For centuries, parents fretted about getting their babies baptized as soon as possible after birth, so that if the child died, it would be able to go to Heaven.  We now know that there is NO Limbo.  God doesn't block little ones from entry to Heaven.
3)  The Jewish people also did not believe in Original Sin.  And Jesus NEVER referred to it at all.
4)  I do believe in personal sin.  Not Original Sin.