Very long post - sorry, skip it if it is too much!
Thought I'd add my two bits worth while waiting for the next cry from upstairs (DS2 has (another!) ear infection...).
But firstly, did you make it to church, BC? And if so, how did you find it? I had a friend come to church for the first time today, and I think she felt comfortable, although it was a Remembrance Day service and therefore a little different.
As to 'born again', as MaryBS says, it comes from John chapter 3, where Jesus uses it to explain to a questioner that you can't be part of God' kingdom unless you are born again. If you read the whole chapter, Jesus seems to be saying that we are alienated from God because of our rejection of him (either consciously and deliberately or simply by treating him with indifference), and therefore we only deserve to be rejected by him in our turn. But the unique and amazing thing about Christianity is that God has reached out to us by sending Jesus to bear the consequences of that rejection - simply because he loves us (John 3:16-17, if you have a Bible handy!). Depending on Jesus' death on the cross as the basis of our new relationship with God is such a radical thing, given that we were totally alienated from him, that the best way Jesus can describe it is to say that it is being born again - moving from one sort of existence into another.
All of which is a rather long-winded way of saying that as far as I can see, all Christians (although obviously not those people who are into it merely as a cultural - I'm British, therefore I must be a Christian - kind of thing) are born again - that is, they've moved into a totally new kind of existence, in which they have a relationship with God. We tend to associate the phrase with American fundamentalism or happy-clappyness - or at least I do, which is why I don't use it very much in case I'm misunderstood! Please come back to me on this if I'm confusing the issue or you think I'm talking rubbish.
As to how my faith plays an active role in my life, that's a bit like asking how DH plays an active role in my life. I'm in a relationship with him, therefore I want to spend time with him, we have mutual friends, we're getting to know each other better and better as time goes on, etc. Just like in a marriage both people like making each other happy, there is a sense in which having a relationship with God means finding out what pleases him and doing it.
Practically, I guess that looks like reading the Bible, alone and with friends, to find out more about God and get to know him better, going to church to do the same thing. And since I've found out more about what God is like, that's thrown more light on my behaviour, so I've had to change some stuff in my life. To give you an example I was reading the letter of James with DS1 tonight and it was all about losing your temper, and now I feel really bad about basically spending the last two days screaming at the kids, so I had to apologise to DS and God!
Does that make any kind of sense at all? Last night was such a grim night, what with ear infections and all, that I'm sure I'm just babbling now. Time for bed!