Ditto on MLeek's "seriously fear for you in this wedding".
I 'came in late' to this discussion, and you've apparently edited out the picture from your first post. But from what I can gather from the responses of others as well your own, it would seem that you are walking into a lions den without even having a chair.
In one of your replies, you indicated you are not intending to buy any new lenses, and are content with the one(s) that came with your kit. I'm hoping your 'kit' came with a fast lens, such as an f2.8, or you will have serious exposure problems. "Standard" kit lenses are almost 100% inadequate for indoor photography under less than brightly-lit situations without a good flash, preferably on a bracket. As a former 35mm photographer now in the digital world (strictly amateur), I still get tricked by unusual lighting situations both indoors and out. I consider myself barely adequate (which probably overstates my abilities) to get 'enough' decent photos of an event whether indoors or out. I know enough to shoot in manual mode most of the time, but often have to take another shot or two to get an exposure I like. In a wedding ceremony, there is no '2nd shot' go get it right. For what it's worth, I was an unpaid ex-family member photographer (for my own use) at my step-daughters wedding this past March, and got into BIG trouble with white balance and exposure both due to a combination of chandelier and wall sconce lighting throughout the ceremony and banquet area at a country club-like setting. Dark wood paneling throughout didn't help, either.
I also have concern that the wedding will include outdoor shooting. One of the recent threads elsewhere on this website had wedding pictures taken outside that the metering was wrong, shooting somewhat into sun, with significantly overexposed areas. Like my own unfamiliarity with constantly-moving-constantly-shooting necessary at a wedding, that photographer also failed to notice background issues in the frame, before they took the shot. In both cases, it was lighting. One poster here several months ago had a beautiful shot of the wedding party on a terrace somewhere, but failed to notice the telephone pole in the background, apparently 'growing' out of the brides' head! Being mentally "focused" on the subject rather than seeing the "whole picture" is still a significant challenge to me.
I doubt I will ever shoot at another wedding. But should I think I may(eg, nuts), I would first 'hire on' as a 2nd shooter/helper/slave (for free, even!) for several weddings to get the 'feel' of what shots to get, what kind of surprises are there, etc. There's also a number of very useful threads on this forum about wedding photography that contain a wealth of information for those wishing to do a wedding.
While it may be too late to back out of the wedding, please don't be overly confident about your skills. Be sure to let the bride and groom know fully that you are new to wedding photography and the results may be less than expected. I'd even try to figure out some kind of contract language to that effect.
Good luck! No matter what, it WILL BE a learning experience for you...BIG TIME!