I find religious people passionate about following the rituals of their religion (for many more than the intention), in a similar way as atheists are passionate about other rituals (their sport, their eating routines, etc.).
For me the absence of thankfulness equals more with awareness. Should I be thankful I have a house? I prefer to be annoyed other people don't have, or that I can't do better (ex: have a house that generates less carbon, etc.).