I would imagine it began on penecost; people who heard second hand the word the apostles preached and corrupted it.
Let's be frank most of the historic heresies re-manifest in folks with a small understanding of scripture and the church quite easily. It's very easy for folks to say Christ wasn't divine, that Christ would not admonish homosexuals, that Mary wasn't really a virgin, that Christ had other siblings, that Christ must have been married, that Christ was a good philosopher but not infailable, that baptism isn't necessary, that marriage isn't necessary, etc etc.
However once you have a good understanding of scripture it's very hard to justify these positions. This is why most of the Dan Brown types are forced to go looking for justifications in the gnostic (forged) gospels.
My point was simply that the age of a practice or idea has nothing to do with its truth. Heresies began in NT times. That's old. As you observed, it goes back even to the Garden.
The only issue, for the Christian, is whether the practice is Biblical.