Basically this. If God is God then what we’re really living for is to serve him, not ourselves! Why does your friend feel so guilty at mass, anyway? I know that a large portion of Catholics always seem to talk about how “guilty” their religion is, but I’ve been to mass and I don’t feel guilty there. Okay, so we kneel and bow before our Lord…that’s called worship…there’s no guilt involved. I find it to be a very nice experience, I actually really enjoy it. Whether one enjoys it or not is pretty irrelevant anyway, for the aforementioned reasons…but maybe your friend could learn to find joy in it. Maybe they just need to look at it differently…like I say it’s not guilt, it’s Christian worship, it’s prayer, and it’s thanksgiving!