What Does Summa Contra Gentiles Mean In English?

What Does Summa Contra Gentiles Mean In English? A longer title is also given as Tractatus de fide catholica, contra Gentiles (or: contra errores infidelium), meaning “Tractate on the universal faith, against the pagans” (or, against the errors of the unbelievers). What is St Thomas Aquinas main objective in Summa Contra Gentiles and Summa Theologica?