The “mother of god” concept is purely a pagan concept. It is vitally important as Catholics base much of their belief system on it. Not admitting the separate fully human and fully God aspect of Jesus causes a total lack of understanding Matt 12:46-50 as well.
Yes, one can’t inordinately elevate Mary in estimation past the role that God Himself gave to her. It has things in common with pagan systems, but keep in mind that pagan systems also sometimes managed to echo elements of Christianity as even evangelicals believe it. I am slow to scream “PAGAN” to something that could be an independent error without showing beyond other explanations some kind of nexus through which it could happen. Likeness doesn’t necessarily establish route of connection. I wrestled vigorously a couple weeks ago with a guy who was entrapped in a philosophical trap that caused him to rail at any manifestation of God in human worship as the work of the devil. It was in vain and I walked away, but not without some enlightenment on my own part.