What would you suggest he repent from, exactly? People who can't commit sin can't repent. Are you saying it's necessary to sin in order to become a Christian?
I am not saying that one MUST sin prior to becoming a Christian. I am saying that if a person has sinned, one must repent and be baptized. That being dunked, immersed, sprinkled, dabbed or wiped ALONE does not meet the criteria set forth by Jesus. Repentance is a key required component.