religious

You can find types in EVERY house of all flavors, but if you are looking toward ones that tend to favor one way:

If you want religion: Alpha Gamma Delta, Alpha Chi Omega, Chi Omega, Phi Mu

If you don't: Alpha Phi, Zeta, Theta and Gamma Phi Beta (the last two tend to attract independent thinkers).

If I'm an atheist, will I fit in with these?

I'll just go ahead and say that I am a member of one of the houses listed above as being "religious" and YES there are a lot of us who are religious, but I know many girls in my PC who are atheist and no one really cares. If you find the house that you fit into and don't listen to stereotypes, you WILL find sisters who accept you and love you for who you are (including your DIFFERENCES). I firmly believe the reason I adore my sisters so much is because we're all able to compliment each other and we create a diverse, well rounded group that is inclusive for everyone.You'll find your home if you form your own opinions in rush. And with this many houses on campus, you'll definitely find your home. You just have to be willing to have an open mind as well.

I'm also in one of the houses you listed as being "religious" and most of my pledge class actually isn't religious at all. I think it varies a lot and shouldn't have a bearing on which house you choose. There are bible beaters and free thinkers in every house. Just be yourself!