Well people earn PhDs by writing about the 'Colossian Heresy,' but I don't think you'll find that it was a Jewish sect. It seems to have been some sort of proto-gnosticism that was inflicting the church in Colosse...
I've read this interpretation a couple dozen times over myself, Steve, but not only does it concoct a supposed heresy out of nothing (i.e. as there is no historical evidence for it whatsoever), but it totally contradicts what is known of true NT-era Gnosticism. The Gnostics utterly despised the Jewish laws, and considered them to be nothing more than the arbitrary, nonsensical and needless commands of a cruel and evil god who had given them to men only to keep them under subjection. This is why they rejected them out of hand completely. That this sect would in some way be proto-typical of early Gnosticism or an amalgamation of early Gnosticism with anything else is completely illogical.
About it not being a Jewish sect (or one with strong Jewish leanings), to argue this, one would again also have to establish from the historical record that there was some heretical religious group in existence during NT times that had adopted Jewish law without being Jewish.
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