The "laws" that "govern our universe", can be said to be emergent properties of the constituents of this universe, eg. matter, energy, etc...
Now one could ask how they came to have these properties, but then that would be almost like asking "Why is a sphere spherical?". If something has no properties then does it actually exist? It is because it has properties... It has properties because it is.
Now we all know where you're going with your OP... but mind if i cut to the chase, and ask sort of a converse question?
If God did create this universe (whether God did or not, i don't know), then why would God need to put laws in place to govern it?
Could God not make it exist in perfection, by God's will alone?
"The good Christian should beware the mathematician and all those who make empty prophecies. The danger already exists that the mathematicians have made a covenant with the devil to darken the spirit and to confine man in the bonds of hell." - St. Augustine