The fact that they were "married" by their minister is irrelevant to the current discussion.
Artificial insemination is not illegal, nor should it be. Unless pressed, I would not express any disapproval to those two folks for their choice to have a child, and I wish them the best.
My sense of social good leads me to believe it is not wrong for society to express disapproval for these arrangements. Of course we should not reject the children! But it is not wrong to express a generally higher appreciation for men and women to be the ones having children, and then in the context of nuclear families.