A fair question and the response to this one is easy. In Romans 1:2-4 Paul speaks of Jesus being of the house of David. This is not a heavenly house, but an earthly one. Thus the remark points to his humanity. The key phrase is "of the seed of David according to the flesh." Gal 4:4-5 says was born of a woman, so again a human person is meant. In addition, the claims about resurrection as a model for our own resurrection in a Jewish context assumes a physical body and humanity for him before he was crucified. These texts belong to the undisputed Paulines. There is another text in the Pastorals, but some do not connect this letter do Paul as I do. It is 1 Timothy 6:13. The key expression here is that "Jesus Christ made his confession before Pilate". If this letter is Paul's then this is exactly what you requested, but the other texts are really all one needs. Paul is not ambiguous on the point of Jesus being human. There are other texts that speak of Jesus taking on humanity in Philippians 2. Part of what makes this discussion move back and forth is that for Paul Jesus was both a transcendent figure and a human figure.

 The issue of relationship to the mysteries of Osiris and others I have covered in earlier posts and will work through again in the midst of covering the twelve points. 

dlb