Let's pretend for a minute that this preposterous idea is true. We are then presented with the documented fact that the Catholic Church comprised nearly all of Christianity for the next thousand years and European Christianity for the next fourteen centuries.
If as you contend the Catholic Church was built upon a farce such as this, would they not have removed all negative mention of Simon Magus? Your theory makes no sense in light of the fact that nothing was done to cover-up Simon Magus' movement. In fact your entire theory is based upon the letters M, A and G.
You should right novels, because this garbage is easily as absurd as "The Da Vinci Code."
The coverup was done by several including that vaunted historian of the Roman Catholic Church himself: Eusebius. He would have us to believe that Simon Magus died in 42 AD when he was taken on by Simon Peter there in Rome. But historians tell us that Simon Magus was there in Rome all during the reign of Claudius and the reign of Nero.
So here is Father Eusebius trying to whitewash Simon Magus out of the picture and try to put Simon Peter there for 25 years instead. Why, pray tell, would such a big lie be so carefully propagated and protected all these years?