The alt-right is a nickname from the status quo; no such monolith exists. The UK Brexiters (is that alt right enough?)  include former Labour voters and usually aren't very religious. 

You are wrong in assuming all individuals and groups are interchangeable and that islam is just the same as Irish, Italian, Ukrainian or Latin people who integrated earlier. Integration happened before the wonderful welfare state came about. Now look at the Swedish paradise...the citizens really rule in that rape capital, do they not?