evidence: Among Jews, fertility growth will continue, due almost entirely to high fertility among the Orthodox. But among Muslims, Buddhists, Hindus, and the "Other" category containing groups like Mormons, Unitarians, Messianic Judaism, and Jehovah’s Witnesses, Needed TFR always exceeds Actual TFR, such that all those groups can expect between a 10 and 40% decline unless offset by immigration. Notably, Hindus, Buddhists, some Christian-related sects, and Muslims do benefit from high rates of additional members through immigration, so their actual community sizes are likely to outperform this forecast.