I don't think biblical argument is the best way to make a case for vegetarianism. If you actually read the Bible, you'll quickly realize that Yahweh is no advocate of vegetarianism. The biblical dietary laws (still practiced by Jews today and called kashrut) proscribe that meat for eating should be killed in a specific way. Yahweh has a list of clean animals which are fit for eating (cows, chickens, lambs, grasshoppers...) and unclean animals which should never be eaten (pigs, shellfish, mice, lizards...), and I don't think any Biblical scholar would claim that the "thou shalt not kill" commandment overrides those dietary rules.

I myself am a vegetarian, and have been for many years. I don't see it as a moral or ethical thing though. I think anybody should be able to choose whatever kind of diet they want, and it's really none of my business what you put in your mouth as long as it isn't my food. Personally my vegetarianism is more of an aesthetic concern; I just don't like the taste or texture of meat, or the thought of putting corpses in my mouth.