Yes, Snape is a child abuser. He insults 11-17 year olds. That's called child abuse. All through Harry's 6 years of schooling, he's always insulted Harry; calling him arrogant, etc. That's child abuse. He's also ruined countless students who wanted to become proficient in the art, because he bullies his students. That's child abuse. He insults Hermione, calls her a "know-it-all", that's also child abuse. Maybe you ought to go read a law-book based on those facts. Any psychologist/psychiatrist will tell you the same thing, as a lot of parents.
Snape doesn't care about James, he held a 10+ year old grudge simply because he was bullied in school, and passed that grudge onto an 11 year old child simply because he could. If Snape honestly wanted to repent, he wouldn't have acted the way he did towards children (and not just Harry alone). Neville was terrified of Snape the entire time he was in school. That's also child abuse. Might want to re-think of what you think "child abuse" actually means.