Racism is generally defined as actions, practices, or beliefs that reflect the racial worldview: the ideology that humans are divided into separate and exclusive biological entities called "races". This ideology entails the belief that members of a race share a set of characteristic traits, abilities, or qualities, that traits of personality, intellect, morality, and other cultural behavioral characteristics are inherited, and that this inheritance means that races can be ranked as innately superior or inferior to others
I would not say that being anti sharia law is racist - though it is quite a statement to make unless you have thoroughly researched its history, its scope and its application. I find some aspects of sharia law morally repugnant but other aspects of it I respect - such as the forbidding of usury.
There are aspects of most cultures including my own and aspects of all religions that I find repugnant - and I will happily say so - however I recognise that people who practice the things that I personally find wrong are not necessarily bad - we just have different beliefs and different ways of behaving - ofc I believe that my way of living is the better way but I suspect they think that their way of doing things is the right way - and who is to judge what is right and wrong? who am I to insist that others behave and follow paths I choose for them?
I don't agree that stoning people to death is humane - but then I don't think that imprisoning someone for saying something stupid on twitter or facebook is right either. I think that circumcising babies is a bad choice - but then I come from a culture that also says that mutilating your body with implants and injecting it with poisons can make you more beautiful.
As the saying goes people in glass houses shouldnt throw stones.
I dont need to research its history to realise sharia law has many evil aspects to it. Same reason i dont need to research nazi germany to realise Hitler was an evil man.