What do people in the US think amendments banning Sharia law would accomplish?

A number of states have seen ballot measures that would prevent judges from employing Sharia law when rendering their decisions. The Texas version—HJR 57, which will apparently not be voted on this year—would have prohibited a Texas court from “from enforcing, considering, or applying a religious or cultural law.”

Given that the First Amendment already prevents judges from incorporating any sort of religious law into their decisions, and given the fact that any movement with enough power to overturn the First Amendment to the US Constitution would have enough power to overturn these lesser measures, what is the point of these amendments?