Why Americans seems to be so obsessed by race and religion?

Browsing questions I found many US "askers" obsessed by racial definition (even when they are not racist). "How Caucasians do this", "How Asians do that ", "How happens that (Insert ethnicity) boys and (other ethnicity) girls..." Research on human genome gave last... show more Browsing questions I found many US "askers" obsessed by racial definition (even when they are not racist). "How Caucasians do this", "How Asians do that ", "How happens that (Insert ethnicity) boys and (other ethnicity) girls..."
Research on human genome gave last evidence that we all come from the same source and only evolution and environment created physical differences we see.
There is not, scientifically , something like "races".
If you want , even the Bible (or the Quran) says more or less the same: there were only Adam and Eve.
Is it so hard to consider all people of all colours just "people"?
Who can explain to me the resilience of this racial issue in modern USA?
On another subject: I understand there is a wide majority of Christians: I come from Italy, witha wide majority of Catholics, I know North Africa (majority of muslims) and Asian countries (Buddist majority). Meanwhile I never saw such an all pervasive presence of religion excluding , may be, in Iran. Why?
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