It may be tempting to say that an atheist, while disbelieving in the existence of God is still capable of living virtuously, while the facially equivalent example of a person with same-sex attractions cannot. This might imply for some that an atheist household may be an appropriate environment for a child to grow and develop in. This line of reasoning is faulty for several reasons.
To begin with, this nation was founded upon Christian principles and ideas about human dignity that simply do not exist in religions or cultures outside the Judeo-Christian tradition. It therefore stands to reason that the government has a palpable interest in seeing that the next generation is raised in an environment where the child will stand the best possible chance of being raised with those values.
This is something that cannot be overstated. Atheists lack any kind of morality that cannot ultimately be boiled down to personal preference. A child needs to be raised in an environment that cements the idea that morality is static, not subjective. The child needs to be discouraged from viewing moral precepts as something that is merely an arbitrary list of cultural conventions. The environment best suited to do this will always be one in which the parents are both orthodox Christians.
Even the Church recognizes that the faith of a child’s parents is of such import that a child may be removed from the household of even biological parents if the civil government determines that the child would not be brought up in the right religious environment. Those that doubt me on this should read up on the case Edgardo Mortara, who was rescued as a six-year-old boy from his Jewish parents by Blessed Pope Pius IX.
Government has a moral obligation to ensure that children are placed in households where they can learn to develop into morally balanced citizens. The best environment for this is in a Christian household, not an atheist one. Therefore, in charitable defense of a child’s immortal soul, atheists should not be allowed to adopt children.