We are Division 2. It's just called something different.
If our other sports win a national championship, they are champs of the highest level of that college sport. If our football team wins a national championship, they are champs of the second highest level of college football.
I've always thought it silly that college football slices a division in two based entirely on sports that are not football. "Well, the bball team plays DI, so the FB team also has to play DI, kinda, in a way, but not the way you're thinking. So, basically, when the planet Krypton exploded . . ."