Again, Trent teaches us: CANON V.-If any one saith, that baptism is free, that is, not necessary unto salvation; let him be anathema.
IOW's you can't/won't read this for your self and question WHY the mention of water here means baptism. Baptism is never mentioned in the conversation with Nicodemus. The verse and after this verse that mentions water, speaks of the natural birth and the spiritural birth, no mention that baptism is being discussed, but that means nothing to you?
Becky