You don't think so, but do you know so?
God the Father, Jesus the Son, and the Holy Ghost are referred to as the Three Persons of the Holy Trinity. The Holy Ghost is not the typical ghost, that is, a human soul whose spirit roams the earth to haunt or warn. Rather, He is the begotten Messenger of God Who inspires His Word into others, bearing qualities that are distinct from a typical ghost.
And so, in the same way, the Three Persons Who are of One God are distinct Members of the Holy Trinity Who do not classify as humanistic persons, but as the Ones Who bring us to the salvation we were created for.
https://www.ewtn.com/catholicism/teachings/trinity-238