(RNS) — Though majorities in both groups support abortion being legal, a new survey by the Public Religion Research Institute found that both white Catholics and white mainline/nonevangelical Protestants have demonstrated a small swing toward an anti-abortion position since 2024.  In a survey conducted throughout much of 2025 and released Thursday (April 23), 57% of white Catholics said abortion should be legal in all or most cases, down from 62% in 2024. Similarly, 65% of white mainline/nonevangelical Protestants said abortion should be legal in all or most cases, down from 69% in 2024. Both changes were statistically significant; however, PRRI-affiliated scholars say it’s too early to tell if the shift is an enduring trend. Kristin Kobes Du Mez, a PRRI senior democracy fellow and history professor at Calvin University in Grand Rapids, Michigan, said several theories could explain the shift.…