Atheist; What do you think about when you are at a religious service?

[edhopper]

I have found myself at churches and temples for various family events and the main thing I think about in terms of the religious service, is how much time and resources are wasted on an imaginary concept. All this effort to think about and pray and worship a God that isn't there.
It's okay because I am there for family and friends, so I sit through it all and then enjoy or comfort the ones I love. But a lot of it still feels like a colossal waste. How do other atheist feel about this?

Believers are free to chime in.