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I don't think Adam existed before the physical creation because God sought out a companion for him. None of the other created life was found to be a suitable mate for him, so God took a bone from his side and created Eve. If Adam had an existence before his physical body, then Eve would have had one too. I am still puzzled over why this occured, since God knows the end from the beginning, but there is much which we are to take by faith.
The tongues which Paul referred to are the spiritual languages which poured forth on the day of Pentacost. This was a sign to the unbelievers in the same way that the unintelligent babble of the Babalonians was a sign to unrepentant Judah. Since they would not hear the prophets of God, God brought forth his will through those whom they could not understand. Since Israel rejected their Messiah, God reproduced an earlier sign by pouring forth tongues. However, there were faithful persons who heard the language being spoken as their own. Others who did not believe, thought that this display of God's power was only drunkeness. Paul made the distinction that tongues were not understood by the person speaking unless they were also interpreted by another who had the gift of interpretation. This shows that tongues are intelligible to God, angels and man, but that the person speaking the tongue may have no understanding of what is being spoken, and the person hearing the voice may not understand it either, for he is speaking mysteries. Most people speaking in tongues do not understand what they are saying, but it is a form of worship and giving of thanks. They are the right of every born again believer and are manifested in many churches today.
I appreciate the deep thought which you have given to this subject, but I'm not sure we can ever truly figure this all out. I have sometimes wondered if God created with age factored in to his creation. Adam was probably created in an adult form. What if all creation was produced with age already present in it's created form, hence, the chicken did come before the egg. Also God says " the evening and the morning" which in our understanding means one day, and the words are written so that we would understand them.