I'm like, really pretty confident the Pixies aren't Christian.
I think it'll be hard to really answer this. I'm not a huge Dave Matthew's Band fan, but from what I understand, a really big part of the draw is the lyrics, and lyrics are often a soft point in Christian music. So if you're trying to offer someone a Christian alternative, I doubt they'll find it satisfying.
If you just like their sound, and you're trying to find bands that offer a similar experience: Maybe Dispatch? They don't market themselves as a Christian band, but I understand that the band members are Christians, and they sometimes perform with Christian artists.