And by establishment, I was referring the the construct of marriage.
In previous generations, the religious conservatives were pushing for the dignity of all men (in the abolition of slavery and in equality for black people), not preserving the institution of slavery.
The Supreme Court once upheld slavery as well.
And as a side note, it was anti-Catholic Democrat klansman in the 20th century who handed down the Supreme Court decision that established the so called separation of church and state (around 95% of all parochial schools were Catholic).
The Supreme Court also once defined marriage as between one man and one woman. Are we making progress now?