"It is true that the phrase "separation of church and state" does not actually appear anywhere in the Constitution of the United States. There is a problem, however, in that some people draw incorrect conclusions from this fact. The absence of this phrase does not mean that it is an invalid concept or that it cannot be used as a legal or judicial principle."

https://www.learnreligions.com/separation-of-church-and-state-myth-249688