Hey Sage and Julie,
Just thought I'd chime in here with a bit of info for consideration about wool. First off, here are some good links to understand the potential issues with wool and farming sheep:
http://www.peta.org/issues/animals-used ... -industry/
In addition, Eloisa wrote an awesome blog about her and Pete's reflections on having a sheep farm and some of why they decided to move on from that:
https://discoverylearningcentre.org/2015/02/17/sheep/
What's important to keep in mind is that wool farming is a for-profit business. So in addition to the question of whether the farmers sell sheep eventually to slaughter for meat, which I'm unsure how common or uncommon that is (though since it's commonplace in the dairy and egg industries, it may be in the wool industry also), there are other issue of love too. As you can see in the link above, there are other potential concerns regarding how sheep are being sheared, mulesing, forced breeding, etc. And then with any farm animals there are questions like, if an animal gets injured, or sick when it gets old, does the farmer care for it as much as possible, in the same way we might care for our dog or cat we love that got sick or injured? A lot of the time, the animal is just killed in those cases because it's now not ideal for profit. Of course, in all the world's sheep farmers there is likely a massive variation in how farmers treat wool sheep and how loving their operations are, but these are just some of the issues to be aware of and research.
Broadly, in regards to all animals, Jesus has said it is unloving to use animals for any human purposes. And wool still requires animals to be sequestered, bred, and used for human purposes and human profit. And as is the case with any bred and farmed group of any farm animals, there are issues about environment impact in regards to how those animals use large amounts of water, create lots of waste, affect topsoil and the quality of local water supply, etc.
I don't know much about knitting but have many friends who do it, and from what I understand there are many vegan options for knitting that are not wool. And as a side note--warm clothing technology is exploding these days, so there's really no need to buy new wool clothing/coats etc. either.
Here are some links that came up when I googled "vegan knitting" and "wool alternative knitting":
http://vegnews.com/articles/page.do?pageId=3816&catId=5
http://www.veganyarn.com/
Anyway hope that helps--happy knitting and crocheting!
Courtney