How can Ethnicity not be Important in terms of Voting Behaviour?

-Evidence sown that the BME Community is very Complicated in the Voting pattern, and actually Religion plays a bigger Role. Hindu and Sikh vote more for Conservatives -BME being concentrated in Lower paid Jobs means that the support may be due to Economic and Class Factors, rather than Ethnicity entirely. Many Asian Hindu Voters have become Richer, which may explain them liking the Conservatives