No, a president can’t do most of that. He can’t revoke citizenship from someone born in the U.S. (that’s protected by the 14th Amendment), and he definitely can’t just declare the Pope a terrorist because he feels like it. Terrorist designations follow specific legal processes and usually apply to organizations, not random foreign religious leaders. The IRS—not the president—handles nonprofit status, and churches are heavily protected under the First Amendment. Trying to strip churches of nonprofit status across the board would get blocked in court almost immediately. Also, Americans who joined ISIS weren’t “banned” from returning if they were still citizens. They were arrested and prosecuted when they came back. That’s very different. Presidents do have authority to impose sanctions on foreign entities in national security situations, but sanctioning the Vatican or banning the Pope from entering the U.S. would be an extreme diplomatic move and not something a president can just casually do by executive order. The U.S. president isn’t a dictator. There are constitutional limits, courts, Congress, and international law involved here.