It depends what is meant when we say wash away sins. It is a personal dedication to God but it also gets rid of previous life and starts again.
As for the child who was disabled and chewed the communion wafer - God would know his intention and as you say - Bloody Catholics, fully agree!
Why did Jesus get baptized?
It could not have been for the removal of sins or for a sign that he had repented of sins, because he was guileless, undefiled, separated from the sinners. And he committed no sin, nor was deceit found in his mouth. A perfect manyet Jesus was baptized!Heb. 7:26; 1*Pet. 2:22.
The sinless man Jesus got baptized because of his desire to do his Fathers will. Explaining this, the apostle Paul applies Psalm 40:6-8 to Jesus Christ: Look! I am come (in the roll of the book it is written about me) to do your will, O God. (Heb. 10:4-7)
Jesus was baptized because he wanted to symbolize his dedication to do Jehovahs will; and he proved that he had made this dedication by turning his back on carpenter work and beginning the ministry.
Jesus made this dedication as a full-grown man: Jesus also was baptized. .*.*. Furthermore, Jesus himself, when he commenced his work, was about thirty years old.Luke 3:21, 23.
Christian baptism today should be performed in imitation of the example that Jesus Christ set.
Thus the significance of Jesus baptism adheres to the baptism of his followers today.
The baptism of a Christian serves as a symbol that one has dedicated his life to God and has vowed, like Jesus: I am come to do your will, O God.
Those who believe that water baptism washes away sins often quote Acts 2:38 as support.
This verse contains the apostle Peters words: Repent, and let each one of you be baptized in the name of Jesus Christ for forgiveness of your sins.
Here Peter, at Pentecost, was talking to those who had sinned against Jesus. How could they gain forgiveness?
They needed to repent and to accept Jesus and his cleansing blood and show this by getting baptized in Jesus name.
Not that the baptismal water would itself wash away their sins; if that were the case they would have had to get rebaptized after every new sin.
But as Acts 22:16 explains: Now why are you delaying? Rise, get baptized and wash your sins away by your calling upon his name.
How are sins washed away?
Not by the water itself but by calling upon his name.
So water baptism for Christians is a symbol of having repented of sins and of having accepted Jesus and of having dedicated ones life to do Jehovahs will faithfully, as Jesus did.