Also, kudos for taking steps in a positive direction. Good IC has been a cornerstone for my healing and personal growth. The fruits borne from my efforts there have flowed into the relationship I have with BS and has made it possible for me to become (I hope) a safer partner. It's okay to feel nervous, you're just going to talk about your story and your feelings and they are whatever they are. If you feel nervous, talk about that.
While I am not a practicing Christian, my therapist is (and the group she belongs to I believe all the therapists are specifically Christian) and it has never been any source of weirdness or pressure. We do talk about spiritual things sometimes but it is generally at my behest rather than hers.
Anyway, you're starting the journey. And this isn't seeing you off, as in, good luck bon voyage! You're getting on the path that so many of us here are strung along at various points of progress. And that's the terrific thing about this place, no matter where one is in the journey. There are people here who are farther along the path, people who seem to be trekking along side by side and still other people who are just stepping on. The shared wisdom of the people farther along the path, the consolation from those who are going through the same thing as us right now, and the inspiration to reach out to the people who are struggling at the places we ourselves have already been...to me that is what SI is all about.
So, instead of bon voyage, welcome to the path from a fellow EvolvingSoul.