It's not cow farts, it's cow belching.

You got that basic fact wrong - which immediately makes me suspicious of the rest of your 'analysis'. Domestic farmed animals far outnumber the ancient herds that roamed the savannas and prairies before humans domesticated cattle, sheep etc. https://www.pnas.org/doi/abs/10.1073/pnas.1711842115

While these animals produce methane, they are heating the climate. Were those extra animals not there, there would be less heating. That is undeniable.

Your figures are suspect and suggest industry involvement; I recommend that readers check out a number of sources before accepting them.

https://phys.org/news/2021-09-fact-methane.html

https://phys.org/news/2021-06-understating-climate-emissions-meat-dairy.html

https://phys.org/news/2021-05-mitigating-emissions-livestock-production-sector.html

Yes, fossil fuels are the main anthropogenic source of GHGs, but we have to do EVERYTHING in our power to decrease anthropogenic climate heating - or answer to our kids for wrecking their future.

Lots of responsible people are choosing to eat less meat.