Fortunately, the GSS has, since 2002, queried respondents four times on the frequency of charitable donations they've made in the past year. The percentages who have not made any charitable contributions in the last year by theistic orientation (n = 5,259):
There's a modest trend in the expected direction, with the more godly tending also to be the more giving. Again, not surprising given that charity is a recurring theme in the New Testament, one of the five pillars of Islam, a fundamental precept in Judaism (tzedakah), etc.
Whether that tendency is perceived as a magnanimous feature or a pathologically altruistic bug depends on how one reacts to the idea of Nietzche's slave and master moralities, and, more sinisterly, how homogeneous or heterogeneous one's community is.
GSS variables used: GIVCHRTY, GOD(1)(2)(3-5)(6)