What a generalization!! plenty of religious people are sad, not all of them are particularly frugal, and not all atheists think of buying toys.
Also the US is a very religious country compared to western or northern Europe where people aren't particularly sad.
Hey he noticed it in his 6 friends he has, maybe it holds true as N grows to 8 billion? /s
Not like the entire point of the Renaissance was to ignore the scripture and stop acting like it was true and to start actually doing experiments in reality