Islam is not a race. Buddhism is not a race.
I fail to see the point of your counter. Judaism is the only religion with which I am familiar in which the label of the followers also denotes their ethnicity (i.e. "Jew" refers to their religious expression as much as it refers to their ethnicity).
Germany was founded by Germans. America was founded by people of many nations. Jews and Deists were definitely among them, but there were hundreds or even thousands of Muslims living in America in 1776.