Let's change the rules when we're losing at the game. :lol:
Anyway, yah, an axis isn't real. It's just a useful definition, such as the major axis of an ellipsoid. The ellipsoid doesn't have to be rotating, but it still has a major axis. It's as arbitrary as the borders of nations. The earth doesn't have any black squiggles run around it defining where one starts and another ends. On the other hand, if you said the earth's 'axis of rotation' tilts at whatever degree in reference to the plane of the solar system, then, well... it has to be rotating. Though that's all it means, because you can redefine the axis of rotation however you want, but you'll have to do some crazy modeling to have everything else still work, but since you said the earth orbits the sun, that might be impossible for all arbitrary axes of rotation.
Also, magnetic force still can't be explained by any of the 4. Earth's composition and internal structure are important.