Republicans give more to charity than democrats?

So a 3 year old article by conservative thinker George Will caught my attention, suggesting that religious Republicans are more likely to give to charities.  The statistics are in dispute and I can't find any reputable media sources that have looked into this.

Assuming that conservatives give even just equal to liberals, it does challenge the criticism of conservatives who attack programs for the poor as simply bloodless and instead as genuinely seeking a non-government solution.