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I agree with Mike (Tobicus) that gear isn't the biggest issue. Most church weddings are open for anyone to attend, so go to one or more and do your own critique on what the photographer does before and during the ceremony. If they don't run you off, hang around for the formals.
Since you asked specifically about gear, it's one of those "less is more" situations. You could easily shoot everything with your 35 & 85, and use the X100 as your backup. Maybe take the 70-300 VR along if distance is going to be an issue and you want to maintain a low profile (highly recommended) during the ceremony. VR is beneficial, but it won't take the place of a tripod in dim light.
Here's a few things that might not be covered in typical wedding blogs:
1) As shipped, Nikon's default setting for "Slot Empty Release Lock" can ruin your day because it allows the shutter to be actuated when the card slots are empty. If you haven't already done so, be sure to change it so that the shutter is LOCKED when the SD slots are empty.
2) Consider how you want to use your SD slots. My preference is to write RAW files to the primary, and JPEG's to the secondary.
3) As a first-timer, you'll probably capture far more images than needed, so take that into consideration when deciding on the size & quantity of SD cards.
4) Get in the habit of NEVER deleting anything with the camera's delete key.
5) Learn to use AUTO-ISO when (a) you're not using flash and (b) the lighting is constantly changing. It works great in Aperture Priority and Manual modes. Your D600 should be good up to ISO 6400.
6) Flash? Many 'tog's shoot without them, and it's not allowed in quite a few churches anyway. Generally speaking, exposure (with or without flash) is a little more complicated because you're shooting the extreme of white dresses and black tuxedo's. Without supplemental fill light, you can end up with dark eyes, especially with people that have deep eye sockets. The problem is exacerbated when the floor & walls are dark and the light source is directly overhead. It helps to stand on a ladder, chair, pew, or anything that causes the subjects to slightly raise their chins toward the light source.
7) Light meter? They're useful for formals, otherwise not of much value.
8) You didn't mention a grey card, but it's a cheap investment that can save you a lot of time and grief with white balance settings in post-processing.
9) If you're shooting in a church, be sure to contact them ahead of time to get their rules.
10) Have a game plan, and then relax and enjoy the experience!!