Be honest how you feel,and do not patronize any of the religion or you will heat up the situation.In this situation,you have to think carefully what to say in order not to be biase.Although,not necessarilly you will supress what you feel,just say it in a very diplomatic way.
You can help the HubPages community highlight top quality content by ranking this answer up or down.
If people are approaching spirituality sincerely, I don't really see any major differences between core values within them up to and including secular humanitarianism, or even what is useful psychologically and/or sociologically.
Phaedrus asked "what is good?" in the Platonic dialogues recorded by Socrates.