ACTS is an Evangelical Christian organisation holding to the following beliefs:

The inspiration and inerrancy of the Bible (both the Old and New Testaments); the creation of man by the direct act of God; the incarnation and virgin birth of Jesus Christ; His identification as the Son of God; His vicarious atonement for the sins of mankind by shedding his blood on the cross; the resurrection of His body from the tomb; His bodily return to earth in the future; the new birth through regeneration by the Holy Spirit; His power to save men from all sin; and the gift of eternal life by the grace of God.

The word "Evangelical" is used broadly to embrace all Bible-believing Christians. The term is further defined by the 1974 Lausanne Covenant.

ACTS is committed by its Constitution to upholding and promoting this Evangelical faith. However, we are ready to serve all denominations and we will not make the mistake of thinking that we have nothing to learn from other traditions. Furthermore, libraries need a wide range of books, including those from differing viewpoints and schools of theology. Therefore everything must be read with discernment. The Scriptures alone remain the supreme judge and standard of our faith and practice. We are well advised in 1 John 4:1, "Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world."