Like I said before, I believe that God does not people in same sex marriages. The Bible's clear that same sex is wrong. However, you're not making it clear who you mean can refuse adoption. A Christian adoption agency shouldn't accept same sex parents as potential adopters. I had a Christian friend who was raped and got pregnant and she only interviewed Christian, same-sex married couples as adopters. However, if we're talking about the government, they shouldn't be able to deny adoption to same sex couples unless they have hard evidence that the child would be much worse off with them than with the birth parents or in foster care. In fact, I don't think the government should be passing laws against behaviour simply because it's immoral. I think people should be free to make moral choices without the fear of reparation from the government. To do so would be a slippery slope towards Iran after the revolution where the oppressive government would arrest people for doing things contrary to Islamic teachings such as drinking alcohol or women showing their hair. I do think that the government should act in a way that facilitates a just and stable society. Murder isn't illegal because it's morally wrong, is illegal because if it wasn't we'd have a very unjust and unstable society. So, when everything that's immoral is illegal you have Iran. When everything that's bad for society is illegal, you have Nazi Germany. The trick is to find a balance between liberty and justice.