your bias is really quite overwhelming, MOO:
they require much thought and (to add the controversy) have no answer from a Godless mindset
how does gravity come about. well, gee, let's think about it for a moment. In this universe, denser objects attract to them less dense objects--that's the most basic principle, though it isn't quite adequate at describing how gravity works--that's where GR comes in handy.
Inertia is also similar. once a mass gets moving, unless friction acts upon it, it will get faster, and faster, and faster. (so long as I've got the right inertia. I could be mistaking this with something else, though similar).
These "laws" are nothing more than the natural consequences of the properties involved, such as mass, friction, volume, density, ad infinitum.
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