The spread of the Delta variant has rekindled a debate that raged in the Supreme Court last term as houses of worship charged that state Covid-related restrictions were violating their religious liberty rights. By and large, the justices ruled against the states and set fresh precedent in a series of emergency orders issued without the benefit of regular briefs or oral arguments. Now, groups that won in the first round of lawsuits hope the stern warnings from the conservative majority last term will influence states as they consider new restrictions, including possible vaccine mandates.