Except heresy cannot be compared with racism, heresy is actually TRUE in many/most cases. It was not crushed by deadly force, it springs eternal. And the treatment of heretics by ancient religious groups, nor to mention modern religious groups, actually makes people MORE likely to be heretical. How can you claim you serve a loving god when in His name you burn people at stakes, have a Spanish inquisition, murder apostates etc? That undermines a religious person’s claim to validity. So I caution against going down that path.