With both Catholics and Protestants, political conservatism increases in proportion with their church attendance. With Protestants, political conservatism increases in proportion to the theological conservatism of their denominations. As a group, Baptists are far more conservative than Episcopalians. Among Lutherans and Presbyterians, members of the more conservative denominations, such as the Lutheran Church, Missouri Synod and the Presbyterian Church in America, are much more conservative than those who belong to the more liberal and larger denominations, the Evangelical Lutheran Church in America and the Presbyterian Church USA.
Which doesn’t change post 54.
The Protestant vote goes Republican, the Catholic vote goes Democrat.