No, it isn't looked down upon at all. You'll still be able to work at firms of all levels, and in any area of law. It's very common for non-law graduates to work as solicitors or barristers - around a third of my peers on the LPC I'm studying did non-law undergraduate degrees. Philosophy and Theology are both wonderful disciplines and that's a really strong degree from a smashing uni - the most important thing is classification; you'll need a 2:1 to work at most good firms, although there are exceptions. Well, actually I'd argue the most important thing is enjoy your experience at University, so make sure to prioritise that a healthy amount!
If, by your second year, you're still keen on a career in law, just speak to the careers team at your uni and ask them to explain the routes you could take.