This position underscores a view of marriage: marriage is so irrelevant, that we can deny it to unions of husband and wife, because equality trumps all:

The full congregation of Raleigh's Pullen Memorial Baptist Church voted Sunday to prohibit the church pastor from legally marrying anyone until she can legally marry same-sex couples under North Carolina law.

... Among them was the pastor, Nancy Petty, who began a church discussion on same-sex marriages this summer when she told congregants signing legal marriage certificates to wed heterosexual couples while not doing the same for homosexual couples had become a burden on her conscience. -- Raleigh News Observer