Yes, a cow produces methane, so did the millions of buffaloes roaming the prairies a couple hundred years ago. And so does just about every other herbivore. It’s natural.
What’s not natural is humanity’s insistence on being transported around to just about everywhere, preferably alone, in a vehicle that has room for 6 or more.
The other day I was shopping and came across a cheese that said, manufactured in Denmark, packed in Poland. I’m guessing the cheese produced way more greenhouse gasses on its way to and from Poland than the cow did producing the milk that went into the cheese.
And that’s just the tip of the iceberg.