Four of the signatories identify themselves as Roman Catholics. One, Michael Tegeder, is the pastor of the Church of St. Edward in Bloomington, MN. I don't know why he doesn't identify himself as a priest in the ad, but he doesn't, and he is. A priest, I mean.
The only woman in the group is Mary Beckfeld, who is a board member of something called "Catholic Rainbow Parents." Its website describes it as a "small but determined group." She's also active on the Archdiocesan Commission on Women. Of her eight children, one is a homosexual man. I'm not sure which of these qualifications makes her a religious leader, but she says she's one.