This is the argument I mounted in a piece entitled DNA as Destiny? that ran in On Religion magazine late last year. Since I'm not quite ready to post new material, I thought I would share this in lieu of a post this week. Here's an extract from the article:
To be prejudiced against a black woman because she is black or because she is a woman (the argument runs) is irrational, but to be prejudiced against a black woman because she is Muslim or Christian is not to be bigoted towards her but rather to pursue rational criticisms against those faith traditions. The tacit basis for this kind of claim is that those aspects of our selves that are not subject to change or choice are the fixed points of reference for our identities, whilst everything else is open to appraisal and can be rejected if it is irrational. While rationality is certainly part of the ideal being applied here, beneath this sort of argument lies a dependence on genetics to resolve questions of diversity.