The fact is that our diet is unsustainable in terms of efficient land use, water use, feed for livestock, deforestation (which alone contributes about 20% of emissions), leading to desertification and loss of biodiversity. Phosphorous and nitrogen use for feed erodes soil sustainability (despite the supposed benefits of grazing) and pollutes waterways and oceans. On top of that excessive antibiotic use in agriculture creates superbugs and pathogens spread from wild animals through livestock and then to humans, and will probably be the source of the next major pandemic.
There are problems with alternatives as well, but industrial meat production is an unmitigated disaster. Even if we dont sharply reduce our production and intake, we will soon be forced to do so.
OK, well that makes a bit more sense than your cryptic "meat is killing the soil". I agree that factory farming is pretty environmentally bad, I mean that's just obvious, but you can buy meat that isn't factory farmed (and costs correspondingly more). But to go from that to advocating veganism is like saying "Drinking a bottle of vodka a day is very bad for you, so you should be teetotal".
And your numbers still sound pretty crazy. All the sources I've seen say livestock contribute to somewhere between 10 and 20% of global GHG emissions (estimates of 14-18%
here). And the vast majority of that comes from cows, so it's a beef/dairy issue, not really a meat issue.
Plus, as I've said, soy is an environmental disaster because it's mostly grown in South America, often on previously forested land cleared for agriculture, and the popularity of vegetarianism/veganism is leading to an explosion in demand even while meat consumption is falling in many parts of the developed world.