Well it isn't a religion but it does indicate a difference in some fundamental beliefs - we are vegetarian and almost everyone else in our group of family/friends eat meat. My SIL was vegetarian and still doesn't eat a lot of meat. Mostly people are very respectful of our choices to be vegetarian and raise our son that way. We do get some comments especially regarding what a vegetarian actually is. And sometimes my mum makes a few comments that make us feel like we are being difficult. We also avoid conversations about meat eating as some people get very offended by us being non-meat eaters even though I don't think we push our views onto anyone else. If they ask us directly then we are honest. We get questions about why we don't eat meat from our friend's kids and we try and answer honestly without disrespecting the fact that their family eats meat. So like any difference of opinion you can get along just fine or you can try and change each other and have lots of clashes. I think presence or lack or respect determines how you all get along - not necc the difference of opinion.