I have not been going as much as I used to when the kids were little, but I always carry when going to church.
And when the kids were younger, they always had a "Children's Mass" before CCD. Talk about a target of opportunity. Basically a church full of kids and their parents in the suburbs.
I always carry a full size 1911 in a shoulder holster, with 2 spare mags in the mag carrier, and a third in the pocket of my blazer or sports coat. 4 mags in total and one in the chamber. It is the gun I shoot the best and I try to sit in the same spot or general area every time I go. It's close to the side entrance with a good view, not near the aisle. And I know for a fact that I'm not the only guy carrying.
I think the official policy is no guns, but if some extremists decides that today is the day they want to shoot up a bunch of kids in a church, I will make sure to go to confession after I put 230 grains of lead in his forehead, and ask for forgiveness.
I wonder how many Hail Mary's and Our Fathers you have to say for contrition?