GMO is basically equivalent with spraying of glyphosate. The whole point of most GMO is to make the plants resistant to glyphosate. If you don't want to eat glyphosate you avoid GMO foods.
There are different kinds of GMO—in addition to RoundupReady (glyphosate resistant) crops, there are Bt crops (mainly corn, as far as I know) that react in an insect’s alkaline gut to form incecticidal protein fragments. The bacterial source of the genes is also used as an organic incecticide, and has no plausible mechanism for causing harm in humans that I am aware of.
