Can a person who refers as agnost said to be an unbeliever?

Recent personal experiences have made a close relative question their Christian beliefs to a far extent. They still believe in the possibility of an all-knowing God but question specific characteristics of Protestant-Christianity such as Priesthood. They strongly believe every Christian should have equal and direct access to God, preferring to align towards agnosticism. From the perspective of protestant-catholicism (Anglicanism) can this individual be said to be an unbeliever?