FI's grandmother passed away over the weekend, after a long battle and a lot of suffering. The funeral is being held tomorrow, and will include a Mass of Christian Burial. I am not religious. It is inappropriate for me to not be praying during those sections of the Mass? Normally I wouldn't ask what to do, but since I will be sitting surrounded by FI's family (all of whom are very religious, except FI), I don't want them to see me as rude (I am not 100% certain that they actually know that I hold no religious beliefs). I would think it might actually be more rude/disrespectful to partake and pretend, but I just wanted to double check