I dont like it when Sharia is used to harm women, but I also dislike your characterization of it as if it were a government function. If women CHOSE to live under Sharia, it is there right. Just like many women chose to live in a culture where they are to be subservient to their Christian husbands, I don't like it, but it is there right.
You are confusing religious choices with government functions.
If we are going to ban Sharia Law because it subjugates women, you are opening the door to banning what many consider "Christian Law" regarding men being the "head of a household".