I had a long post, but frankly, there's a simpler way.
The genetic basis for the concept of race as it was understood is pissweak, I agree.
My problem with the statement "Race does not exist" is more social than scientific - there are groups with specific needs, both medical and social, which correspond to the old ideas of race, here if nowhere else in the world. Deny the difference and you take just a little more wind out of the sails of the people making positive changes, while those who're on the opposite side aren't going to believe you anyway.
Maybe this sort of thinking doesn't apply where you guys are, since the social/racial dynamics are different across the world. Unfortunately, I haven't the time to go through the issues that racial oversensitivity has caused and is causing here, especially in the north and isolated communities in the outback, but I'm not willing to concede the non-existence of race, as long as there is any genetic backing at all, when to do so would hinder social progress.