Q. 1. What is the difference between an apologist and a theologian? Are they not the same?
A. 1. No, they are not the same.
The theologian is one who does a systematic study of the existence and nature of God or religious truth and their relationship to and influence upon other beings.
The apologist is one who speaks or writes in defense of someone or something. In the case of the christian apologist, it is a person who argues in defense or justification of something, such as a doctrine, policy, or institution.
When it comes to defending the Catholic faith, a theologian should be able to act as an apologist. The apologist does not need to be a theologian.
According to number 1285 of the Catechism of the Catholic Church...
"Baptism, the Eucharist, and the sacrament of Confirmation together constitute the "sacraments of Christian initiation," whose unity must be safeguarded. It must be explained to the faithful that the reception of the sacrament of Confirmation is necessary for the completion of baptismal grace. For "by the sacrament of Confirmation, [the baptized] are more perfectly bound to the Church and are enriched with a special strength of the Holy Spirit. Hence they are, as true witnesses of Christ, more strictly obliged to spread and defend the faith by word and deed."
In other words, Catholics, through the Sacrament of Confirmation, armed with the necessary spiritual tools, are required to act as apologists by spreading and defending the Catholic faith by word and deed. They are not required to be theologians.