Chances are that the soy milk has also been genetically modified. Not saying this is necessarily a bad thing, just that there are also a number of unknowns to add to your line up....
With the soy milk I drink, I highly doubt it. Esp. since it states right on the package 'does not contain GMO Soybeans'. Most of the stuff I drink is also organic. 8th Continent, OTOH, not only uses crap, extra chemicals and isn't organic, also uses GM soybeans.