Black voters seem likely to vote in higher numbers for Trump than any other Republican as do working class White Democrats. That isn't to say Trump will win those demographics, but 20% of the Black vote should be enough for any Republican to win nationally when the Republican average is 5% lately.

Hispanics don't vote in large numbers and Chicanos -- the only category Trump might be especially unpopular with -- overwhelmingly don't live in swing states or turn out to vote. Muslims don't make up a large voting block and already are overwhelmingly Democrats.

I'm not predicting a Trump victory, but you are far too sanguine about his chances and the underlying demographic realities.