He is correct!
The First Amendment only limits one group of people; The Congress.
Read it:
Amendment I (1791)
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.
Individuals, states, and local governments are not limited. Congress is and Congressmen are not limited from having religious objects or expressing religious opinions. Cities, state governments, and Federal lands and buildings are not prohibited from having the Ten Commandments or a cross or a menorah or a crescent moon and star or manger scene. Prohibiting these are a misinterpretation of the First Amendment.
State and local governments could even specify or ban religions if their constituting documents don’t prohibit it.
Too many people have never read the Constitution and do not know that most of what the Federal Government is doing is not Constitutional.
Re: 12 - “State and local governments could even specify or ban religions if their constituting documents don’t prohibit it.”
Not possible. The First Amendment is fully incorporated and restricts States from doing that.