Did you take these in RAW? If so, you can edit in ACR and help remove some of the noise and fix other settings. If you didn't, you could probably find a photoshop action that will help remove the noise or smooth it. I also have a photoshop action that adds crisp details in the image if needed. If you want to know what I use, you can shoot me an email or message. I'm not sure if I'm suppose to put links on these kind of forums or what the "rule" is.
Was it pretty dark in the church? Shooting with a high ISO will add grain. I have to give you props for not busting out your flash because you wanted to capture the beautiful lighting and details in the back. Lighting can be tricky but it gets easier with practice and knowing your settings.
Overall I really love the image! I love how she is looking up at her husband just glowing. You captured a beautiful photograph and I think they will be so excited to see these.