Wannabe - sounds like you've maybe had a negative experience in the past. ACtually strictly speaking all Christians are "born again" - that's the definition of a christian; someone who's left behind an old way of life and making a real attempt to live a new way of life. That's not to say Christians won't make mistakes, some are selfish, liars, adulterous etc etc etc, but they have a new perspective on life.
I'm a born again Christian and made a commitment at 13 (is that later in life?) - I didn't become a better person by any means, but I believe I 've found what I should be aiming for - namely to live a life like Jesus Christ. Impossible for humans, but with ( I believe) God's forgiveness and grace and patience, worth it and then some.
Supersox - your friend will not be trying to "recruit" you to a pyramid scheme/tupperware party/double glazing sales, but she will want you, maybe just once, to hear something of what she believes. I f I knew you and got talking over time, then I would probably do something similar.
Just because it's not a mainstream church like a CofE/Baptist/Presbyterian etc, doesn't mean that everyone who attends has had their intelligence surgically removed at the door.
If people raise their hands for example(they might not) then it's just an expression of how strongly they feel about the relationship they belive they have with Jesus Christ,. That might make you feel uncomfortable. Tbh I get a bit squirmy about some expressions of worship cos I feel like I'm intruding on someone's very intimate experience.
The congregation might not do anything of the sort - it might just be All things bright and beautiful with songs of praise type hats everywhere (eurgh).
If there's anything that made you cringe then just tell her - she'd either agree or laugh. It's good for Christians to get a view of how we look to "outsiders".
THere a minority of "christian" churches as madamez said which will be bordering on the culty. THey are not biblical and will be generally led by one overbearing and power hungry leader. They're prone to split ocaasionally so find out how new and what size your friend's church is - that might give you an idea.
I'm just so glad that Wannabe said "generally" so many times in her post cos that really was quite the most sweeping generalisation of Christianity I have read in a long time.