Re: the religion aspect.
First, that's probably not something that came from the sorority. More than likely, there is a group of members who is very devout and maybe even lead a Bible study group within the chapter.
Those members can be very vocal. You may feel like you need to join in, but you really don't.
Second, you're in the South, and Christian churches and religion pay a big part in daily life in the South. Often, church is the main social outlet in town. I would suggest talking to your vp
rograms (sometimes called an education chairman) about a program about your sorority's stance on faith. It could even branch out into a discussion about the different faiths represented in your chapter.
I'm sorry this makes you uncomfortable - it's never meant to. I know that a lot of people who move to the South get all bent out of shape when a lot of people ask where they go to church. It's just how we're friendly - we want to make sure you feel included (if anybody asks you that, just say you've found a church home - you don't have to elaborate).