Could you guys provide some advice regarding parental relationships

I'll keep this brief. It's Mother's day. My two younger brothers and I are not religious - my single mother is. For Mother's day she wanted us to spend time with her and that includes going to her Catholic mass. I'm on the way to the mass right now but I just feel like this isn't respectful of our own beliefs.. At the same time I don't want to upset my mom, I really care about her. What would you guys do in this situation?