What is the importance of Christian baptism?

Christian baptism is, according to the Bible, an outward testimony of what has occurred inwardly in a believer's life. Christian baptism illustrates a believer's identification with Christ's death, burial, and resurrection. The Bible declares, "Or don't you know that all of us who were baptized into Christ Jesus were baptized into his death? We were therefore buried with Him through baptism into death in order that, just as Christ was raised from the dead through the glory of the Father, we too may live a new life" (Romans 6:3-4). In Christian baptism, the action of being immersed in the water symbolizes dying and being buried with Christ. The action of coming out of the water pictures Christ's resurrection.

In Christian baptism, there are two requirements before a person is baptized: 1) the person being baptized must have trusted in Jesus Christ as Savior, and 2) the person must understand what baptism signifies. If a person knows the Lord Jesus as Savior, understands that Christian baptism is a step of obedience in publicly proclaiming his faith in Christ, and desires to be baptized, then there is no reason to prevent the believer from being baptized. According to the Bible, Christian baptism is important because it is a step of obedience—publicly declaring faith in Christ and commitment to Him—an identification with Christ's death, burial, and resurrection.

[rickpettey]

You know that this video is going to be completely unbiblical when it answers the question as to what Christian baptism is by saying that the Bible teaches that it is "an outward testimony of what has occurred inwardly in a believer's life."    Please show me that text in Scripture.  It then goes on to quote Rom. 6:3ff as if to support its original false statement. 
How can anyone who takes God's Word seriously make such a statement about baptism as if it is the "Christian's testimony" when the Bible teaches clearly (especially in the Greek) that it is God's work in which He actually creates faith, seals them with His name and through which bestows His forgiveness of sins? 
This is one of the leading examples where rationalism has so taken over even in the minds of Christians.  Every time I have a passionate discussion over the fact that baptism is God's work and not man's through which He creates faith, the typical  immediate reaction is "How can you rely upon water to create faith?"  That is a rational question, not a biblical one.  The only faithful question is: "what does God's word say?"