I can't say I know how many in America do. All I know is that according to Pew and Gallup polls the majors of Muslims in Majority Muslim countries support Sharia law. That is precisely why going into Iraq was idiotic. Most Muslims don't wish for secularism. Even in the UK most British Muslims think homosexuality should be illegal, something like a quarter felt sympathy for the Charlie Hebdo attacks. If it was just a small fringe then we wouldn't be having this discussion. It's sad but it is also true to say that many Muslims don't have a clue about what constitutes a secular society. If you think Blasphemy is a real problem you shouldn't be in a country that separates religion from politics.