Are we self-centered, self-interested, and self-involved? Yes.
But the image of the stingy American church is essentially a false one. (It particularly irks me when the criticism of outside celebrities and even younger inside church leaders make it sound like they invented missions and charity ten years ago.)
Douglas Wilson has a revealing and penetrating perspective:
Americans are about six percent of the world’s population and we account for about forty-five percent of the world’s philanthropy. Among Americans, believers are far more generous than secularists. Among believers, Protestants are more liberal in their giving than Catholics. Among Protestants, evangelicals are more generous than mainliners. But if you were ask a secular arbiter of all that is philanthropic for his opinion on how we were doing, he would invert the whole thing. That much said, when the standard is God’s generosity to us, most of us are not nearly as generous to others as we ought to be. We should pray for grace to overflow more liberally still. But we may be pardoned if the evangelical artesian well, producing 20 gallons a minute, while wishing it could be 40, doesn’t want to hear lectures on charity from the dry hole of secular leftism.