jon14 - Foster parents are also not asked what they would do if the child demanded to be taken to a planetarium that insisted that the moon was made of cheese, or what they would do if the child demanded that the fairy inspectors be called in to examine the bottom of their garden.
Your example is similarly pointless.
Easy to say it's pointless but less easy to give a good reason why. Many Chirstians/Muslims/Atheists would teach their children homosexual practice is wrong. Many homosexual couples would teach children in thir care that Christianity is wrong.
Why are Christians not allowed to adopt on the basis of their views about homosexuality, but homosexual couples are not banned from adopting children on the basis of their views of Christianity?