>Can someone please explain in more detail this "Marcinon
>vs. Orthodoxy" controversy? I'm not familiar with this
>sort of subject matter.
"Marcionism" was based on the teaching of Marcion (note spelling, which may be different, possibly, in different sources). Marcion (d.c. 160) held that Christianity had no connection whatever with Judaism and that the God revealed in the OT was not the God of the NT. He taught that the OT was not a "Christian" book and that the Jewish elements in the NT should be purged.
Marcion compiled the FIRST KNOWN CANON OF SCRIPTURE which included only a shortened version of Luke and ten Pauline epistles (which were edited and revised).
Marcionism later came to refer to the general neglect of the OT by the Christian Church.
[Source: "Larousse Dictionary of Beliefs & Religions."]