The Christian faith is not mere data, it is the Holy Spirit at work in the believer through the Gospel, and the Law properly distinguished. The Christian faith is passed on man to man by the witness to and the power of the Word of God, particularly the gospel preached to terrified consciences. All outreach of the Church is mission. Local missions are accomplished by believers living in the lively hope of their faith, and giving a defense when asked about that hope, even as Peter writes. Particularly in outreach, clarity of doctrine and care for precision in the truth of the Word of God proclaimed is of ultimate importance.
Sound catechesis is integral to mission outreach whether local or distant.