I don't get how that's a myth.... it's an estimate... the site you posted even said that there's no definate number, so all we can do is estimate... but it did happen.
The Bible teaches that ALL HAVE SINNED AND FALLEN SHORT OF THE GLORY OF GOD. Sin is sin, and we are all deserving of death, which is the 'wages of sin.' We simply need to accept the gift of Jesus's sacrifice to have our sins forgiven, whatever they may be. It doesn't matter what a person has done; we are washed clean in the blood of Christ. All each person's sins are between that person and God. No one is superior to anyone else.