Only altruistic surrogacy should be legal
If no money is involved, than surrogacy is pure generosity.
It is unfair to deprive a child of the right to have parents of both sexes.
Religion is often associated with anti-LGBT views, and with this comes the belief that same-sex couples should not be able to have children.
Children who grow up in same-sex homes are worse off, and it is cruel to raise a child without both a mother and a father. By allowing surrogacy for same-sex couples, the state is encouraging a deviant home environment for children.
Children of same-sex couples do not suffer. In fact they have been found to outperform children from heterosexual parents in educational settings and have equal health outcomes to children from heterosexual parents.
[P1] Children need parents of both sexes. [P2] Allowing children to be born through surrogacy to same-sex couples is wrong.
[Rejecting P1] Children do not need parents of both sexes.