Ramadan:Every Surah has a messege/purpose.What is the purpose of Surah-Al-Imran?

Christians are lied to by their preacher every Sunday just to collect donations from them. Allah SWT has revealed Surah Ale-Imran to tell Christians what were the facts concerning Jesus Christ, his propagation of Islam and his message that there is no God but Allah and Jusus was merely a Prophet of God like many many prophets were before him and to introduce Islam to Christians.