And there will always be fragments.
Even if you erase the white race, black race, middle eastern, etc there will always be new identities formed - like the anglo-indians in india who are half indian half british and identify as their own community.
The best answer is to allow everyone the freedom to choose their path and teach others the simple rule - if you want the freedom to live your life without judgement you must extend the same to others of different views.
It is just like the principle of karma.
Lord Acton, Lord Chief Justice of England, 1875 - "The issue which has swept down the centuries and which will have to be fought sooner or later is the People v. The Banks."