So then, the church is teaching children that their mothers and fathers should be together.
Leaving aside for the moment the question of whether the daycare has the right to deny entry to children of parents in a same-sex relationship. There is no question that they do, both as matter of faith and the law. In the case of parents who divorce, the mother and father are not together. Should the church deny entry to children of divorced parents? Or parents who were divorced and remarried?
In my opinion? No.
But church schools should make sure all parents understand and agree to a statement of faith (or an acknowledgement of church beliefs) before registering their children.