Marius Victorinus notes how the Symmachians taught that Jesus is Adam.
Stephen Andrew Cooper, Marius Victorinus' Commentary on Galatians (Oxford Early Christian Studies; Oxford: Oxford University Press, 2005), 265-66
But I saw no one else of the apostles, except James the Lord’s brother (1: 19). Paul, with a great teaching and great ingenuity, has also added this. First off, in that he spoke in this manner: Of the apostles, I saw no one else. For the Symmachians make out James as a twelfth apostle; and those who add the observation of Judaism to our Lord Jesus Christ follow him, although the Symmachians also confess Jesus Christ differently. They say that he is Adam himself, and is the universal soul, and other blasphemies of this sort.