The reality of Adam wasn't even questioned by the early brethren. The term "quickening spirit," of course, means, "the living spirit," which scholars have said is an esoteric term referring to the perfected physical body of Jesus after the resurrection.
Most often people think of spirit as being non-corporeal, but it refers to the physical body animated by spirit. (Cited by Nibley as: It has been shown that the term "the Living Jesus" (and even kyrios) refers specifically to the risen Lord, Schmidt, Gespräche Jesu, 264; cf. James Rendel Harris, The Odes and Psalms of Solomon: Now First Published from the Syriac Version (Cambridge: Cambridge University Press, 1909), 73. Thus the same value must be given to the opening line of the Gospel of Thomas 80:10 (=NHLE 32:10, p. 118), as to the Oxyrhynchus Logia, no. 8 (1): "sayings which Jesus who liveth and was dead spake to Judas Thomas"; cf. Gospel of Thomas 99:7-8 (=NHLE 51:7-8, p. 129). The conversational and questioning form of discourse is another clue, Schmidt, Gespräche Jesu, 206; Puech and Quispel, "Les écrits gnostiques du Codex Jung," 9, n. 3; Gospel of Thomas 81:14-17 (=NHLE 33:14-17, p.118); Oxyrhynchus Logia, 4-5, 13 (6), 8 (1); a large number of the pseudo Acts in E.A. Wallis Budge, Contendings of the Apostles (Oxford: Oxford University Press, 1935), begin with the Apostles questioning Christ after the Resurrection. Where an account of the Resurrection or Descensus is included in the report the setting is naturally post-resurrectional: this refers to all the apocrypha mentioned below, notes 63-66. The 40-day situation is implied where the resurrection of others is described, as in the second Akhmim fragment of the Gospel of Peter, in ANT, 508; Gospel of the Twelve Apostles 2, in PO 2:135; and Acts of Thomas 54-55, in ANT, 390-91. The Prologue to the Discourse on Abbatôn purports to offer documentary evidence from the hands of the Apostles for the typical 40-day situation it describes, in E.A. Wallis Budge, Coptic Martyrdoms (London: British Museum, 1914; reprinted New York: AMS, 1977), 225—26, 474-75.)