This was weird. Like you killed off Voldemort while he was still a child. That should have massive repercussions. For example, without him their are no Death Eaters. Without the Death Eaters I don't think their is a significant pureblood faction that is anti muggleborn, half blood, or muggle and even if their is one it doesn't have the power to be a real threat the way Grindelwald's and Voldemort's where. Without such a faction Severus Snape is unlikely to go bad due to his terrible experience at Hogwarts (combined with a terrible home life) and if Snape doesn't go bad I don't think Lily falls for Potter which means no Harry (unless he is Snape's and Lily's son or James hooked up with someone else and named his son Harry anyway).
Fi3l