there are so many problems. First off harry james potter was an accident. lily and james loved him of course but they were nineteen and in the middle of a war. i feel like they would have been more careful after that. Then there's the fact that lily and snape weren't friends and hadn't been since he called her a racial slur when they were fifteen. also snape was a death eater which they, as members of the order, would have known. also also screw snape.