if you think about it... anything cross bread is genetically modified
No.
The "genetic modification" folks are talking about with "GMO" or "GE" (Genetic Engineering) in respect to this topic involve the transference of genes of in ways and and of types that are extremely rare in nature.
No matter how much you bred different varieties of corn together, before GMO corn with the trait became available, you would never get one to pick up the genes to produce Bt. Its just wasn't in the genes of the species. Now it is possible because we've added those genes to the plants.
Now, you might have Bt spontaneously occur. Theoretically enough monkeys equipped with typewriters would also eventually randomly type out the entire works of William Shakespeare, though it might take a period of time longer than the lifespan of the universe and everything would collapse into a giant black hole and go bang again before it happened.
Slightly more likely, though far less likely than me becoming President and Zooey Deschanel being First Lady, is you would have a virus pick up the Bt genes from the bacterium that normally produces it, then transfer those genes to a corn plant, and have that corn plant be able to pass on the newly acquired genes. With billions of years of evolution working away, it does happen in nature that a useful trait is picked up and passed on in the genetics of a species after being transferred by a virus, but extremely rarely.
But for all practical purposes, there is no "luck" involved that folks are short-circuiting by using GMO techniques -- most of the desired traits are being taken from other organisms and introduced to species to which conventional breeding would not have allowed the transference of the genes that produce the trait.
