https://www.sophiainstitute.com/products/item/exorcist-explains-the-demonic
Fr. Gabrielle says “yes”. He performed exorcisms for decades, so I tend to believe him.
I guess it also depends how one defines “a Christian”. If one believes one becomes a Christian at the moment of Baptism, then the answer is yes. If not, well I guess one’s mileage may vary (but I’m not going to go there, I’ll leave it to others who wish to virtually flog themselves debate that point ).
“one becomes a Christian at the moment of Baptism”
Baptism with water opens the soul so that a person is prepared for Baptism of the Holy Spirit. The Holy Spirit cleans the House.