Bill, ask this question on your original post so that people can answer you knowing the other information you have provided. Thanks!
You may think it's crazy however, you allowed your name to be put on the piece of paper that named you as the father. So, you in essence said "I realize this is not my baby yet I will agree to be the named father". So, yes you will have to disestablish your paternity. However, the court may still not allow you to do that because you already agreed to it for whatever reason. Claiming you are the father of a child especially when you know you are not is a serious decision the court may not necessarily allow you to change that now just because you have decided you changed your mind. You made a commitment to that child why would you be so surprised that he court may expect you to keep that commitment, especially when there is no one to take your place except the state?