Do American people know what is sharia law? why do some said?

No rational person would accept sharia law into an already perfectly functioning democracy - be sure to point out to your friends that there are many, many different variations of sharia law and can be anything from enforcement of wearing the Hijab (veil) to bans on music, dancing, alcohol or pork. Sharia law is a ridiculously discriminatory Islamic plague on society that would never be accepted by any Western government, thank the stars.