Only the blood of Jesus can wash away sins. How do we come in contact with the blood? Oh that is the question. What do the scriptures say? Where did his blood flow? At his death? Romans 6:4 says that we are baptized into his death. Lets go another route. Heb 9:22 says that without the shedding of blood there is no remission of sins. I know we all agree on that point. Acts 2:38 says that baptism is for the remission of sins, again tying baptism to the blood and remission of sins. Eph 1:7 says "In Him we have redemption through His blood, the forgiveness of sins, according to the riches of His grace". In whom? Christ. How do we get into Christ? Again, back to baptism (Rom 6:3-4, Gal 3:27). But someone may say, baptism is a work and we are saved by faith. We are saved by faith, no argument. Most people don't understand biblical faith. Read Gal 3:26-27. It says we are childern of God by faith because we have been baptized INTO Christ. Lets go another route, what else did Jesus' blood do? It purchased the church, according to Acts 20:28. Christ is savior of the body (Eph 5:23) which is the church (Eph 1:22-23, Col 1:18). How do we get INTO the church? We are baptized into the church (I Cor 12:13). Christ adds to the church those who are being saved (Acts 2:47). Baptism adds us the the church, I don't think we have disagreement on this point, but I'm not sure. When Philip taught the Eunuch, he preached Jesus which included water baptism (Acts 8:35-36). See how nicely this all ties together. Baptism washes away our sins. Isn't that exactly what Saul was told to do after believing and praying for 3 days,"And now why are you waiting? Arise and be baptized, and wash away your sins, calling on the name of the Lord Acts 22:16." Why did this believer have sins to be washed away after 3 days of praying? Only because he had not come in contact with the blood of Christ. You see, it is not the water, but the blood of Jesus. Not because God owes us anything or we earn anything in baptism, but by our faithful obedience. You cannot lay out a logical explaination using scriptures of how we come in contact with the blood, how we get into Christ, or how we get into the Church without mentioning baptism. Did you ever wonder why blood and water came forth from Jesus' side (John 19:34). The Spirit, water and blood all agree as one according to I John 5:8. On the day of Pentecost, the spirit was talking though Peter (ACts 2:4). Acts 2:38 Then Peter (Spirit - talking though Peter) said to them, "Repent, and let every one of you be baptized (water) in the name of Jesus Christ for the remission of sins (blood - see also Matt 26:28); and you shall receive the gift of the Holy Spirit. Here we have the Spirit, water and blood all agreeing. We are saved by grace through faith, how wonderful.