Yes, I can judge a truth, by it's utility. I see that evolution has no utility compared to creationism, it has done no good. GMO's case in point. Evolutionists eating organic food? Action speaks louder than words, they don't trust their own genetic engineers.
If I have a relative fall ill, and there is no medical hope for the person, I can think of a very high utility for a magical curative answer (unicorns, magic potions, prayer, whichever). The usefulness of those things don't make them more true, and I end up wasting time on fancies rather than addressing the sad truth of my relative's illness and preparing accordingly.
I do not suffer in my belief that there's probably no gods or afterlife. I merely enjoy my life and the world in its brevity, instead of treating it like a weigh-station to the next.
As for GMO and evolution, there's not really a connection between the two. While genetics is important to evolutionary study, not all genetics study is evolutionary science. What makes GMO food is not a process of evolution but artificial selection, no different than what agriculture has been doing since the dawn of its existence. Just faster. I don't mind GMO foods so long as it's done responsibly, just like other agriculture. Making a GMO food that is both hard to contain and a threat to native species bugs me about as much as making chickens, pigs and cows through selective breeding who suffer under the weight of deformities which makes more muscles in the right place. But when GMO is done right it can and has made hardier crops which need less pesticide, last longer in transportation, can live in arid climates. The net gain is GMO cereals have prevented thousands of starvation cases.
But, again, nothing to do with evolution.
As for evolution's actual utility in day-to-day, evolution has a ton of practical value. It's from evolutionary biology that bring us our largest medical science industries like bioinformatics (billion dollar industry) and medical genetics (immunology, microbiology, morphogenesis). Which has provided lifesaving treatment for many more thousands.