I hope you're saying an angel is not a HUMAN person because an angel is definitely a "who". A rock is not a person, a shrub is not a person, but an angel is a person, there are three PERSONS in one God... Point being, since an angel isn't a thing but a who, an angel is by definition a person.
Now, since you chose to pick one fragment out of my post and then prooftexted what I wrote against me I'm not sure what else to do with you other than reiterate that the word "saint" means "holy" so we have places named "holy cross", (Santa Cruz, Santa Croce, etc).
We are referred to as God's Holy People in the Holy Mass of the Holy Church. We read the Holy Gospels in the Holy Bible and celebrate holy days... all of those uses of holy derive from the same word in latin, sanctus. Surely you remember singing the Sanctus when you were a practicing Catholic...