Is this a Christian protest?

I consistently try to make the point with friends that traditional Christianity's opposition to same-sex marriage and parenting cannot be equated with homophobia, though I admit that the articulation of that opposition often bears a striking resemblance to homophobia.  If Christians are to maintain the position that the children of same-sex parents are worse off than the children of opposite-sex parents, they will have to be careful to ensure that the differences are not due, at least in part, to the social hostility toward those families to which Christians are prone to contribute.  More particularly, what justification does the Gospel provide for Christian churches to picket against a group of children on vacation with their gay parents?