They were. You could check it out in their archives, if the archives go back that far.
He must know --- because he doesn't live under a rock --- that the LGBT agenda is centered on the deconstruction of sex, gender, marriage and family. Which means --- and sooner rather than later--- the deconstruction childhood, of personhood, and of a sustainable society.
I don't see how he thinks he can "strengthen" marriage by deconstructing it. It's like "strengthening housing" via termites, dry rot, and dynamite.
He seems to be exactly midway between the two principle phases of human history:
Believe it or not, Jim Wallis and Sojourners used to be pro-life (yes, in the sense of anti-abortion) and pro-family (in the sense of mom, dad, and the kids) 30 years ago.
I actually subscribed to Sojourners for a couple years, back in the early '80s. What little I recall of it was that it was pretty tedious.
The net accessible archive for the Sojourners magazine gets real sporadic before the mid-1990s.