I have promised my fiancé that we can be married in a church and she can wear a gown (we have been both divorced twice). I would like your thoughts on a reception at home, very casual and I would do most of the cooking, i.e., grilling?

You can certainly be married in a church and then have a casual, intimate reception at your home where you cook/grill. The guests will probably appreciate the comfortable, casual setting.

You will want to talk with the clergyperson at the church to be sure they will perform the ceremony for divorced couples (some do, some don't). But, I'm sure you will be able to find a church/clergy who will perform the service. And there is no reason that the bride cannot wear a wedding gown. Generally brides from multiple marriages do not wear a veil, but rather wear a hat, flowers, jeweled combs, etc. If the reception is casual, she (and you)can always change after the ceremony, or just wear your wedding clothes (and an apron for the chef!).