After some math, 2.9% still feels like more than most people donate to their non-religious causes. 2.9% of the average annual expenditure is more than 1400 dollars! I am willing to accept that Christians are doing more for their cause than I am for mine. Mine is more effective, but unless I can say that Christianity is a net negative (I can't), when you multiply it through the effectiveness, I still come out below Christians.