Why was Calvin so wrong?
I can prove - without a doubt - that John Calvin is not one of the 'elect', and certainly won't be amongst those that are saved. And being a damned man, it invalidates his entire theological base, namely that of pre-destination, which many Protestant (heretical) 'churches' (i.e. sects) follow.
Calvin was quite a very petty man, and made it a point to ruin and even kill those that in any way were superiors to him in any way. We can start with the example of Sebastian Castellio, a very intelligent man who had become a Reformationist upon being moved by the agonized screams of 'heretics' put to death at the stake by the Inquisition. Initially, Castellio got on very well with John Calvin, upon arriving at Geneva. However, things began to change as others perceived Castellio as a man of greater intelligence and authority and piety than Calvin (in one well-known example, Castellio was the only member of the influential clergy who personally visited with those afflicted by scourge, offering words of comfort and praying with them, while Calvin hid in his house [funnily enough, why should Calvin have been afraid? For surely, according to him, he had been pre-destined to spread his 'true' version of the Gospel, and thus, would have survived the plague, meaning he was a hypocrite) which caused this petty man to devote himself to ruining Castellio, driving him to poverty in which he died, and only because of the intervention of the other intellectuals of Europe did Calvin not outright kill him.
Then we have the case of Michael Servetus, who was a Reformationist-minded man and even a friend of Calvin, though the latter eventually broke it off in the style of a triggered SJW/Tumblrina who can't bear to hear someone say something even slightly dissenting, even if it is politely and in good faith. Calvin then devoted himself to plan for Servetus' death, arranging for him to suffer a "painful death, for beheading is too kind", even though - being a foreigner -, the law of Geneva could not actually put him to death. However, through maneuvering entirely on his part, John Calvin was able to assure that Servetus was burned at the stake, and - due to his influence - was able to arrange for it to be as painful as possible (green wood was used, because it would burn slower and allow Servetus' body to literally 'bake' before being seared; at the very last minute, Calvin instructed that Servetus' book - consisting of correspondence with Calvin - be strapped to Servetus' face, so that these would go up in flames and burn his face in agonizing torment). Calvin would later boast and celebrate the killing of this man, whom many other Reformationist-minded men had held up as a man of great piety, virtue, and intelligence.
Which brings me to the point: if John Calvin had been pre-destined to be saved, as he so ardently believed, then he would have been unable to commit any grievous act as he did, and many times throughout his life. As such, seeing as he did commit many grievous acts, it is obvious that he did not even fulfill his own criteria for those who are elected by God before Creation, meaning he is damned, even by his own 'theology' (literally on the same tier as Dianetics). And why should the teachings on Godly matters deriving from a damned soul be taught? As such, John Calvin's ideas should be considered not only irrelevant, but of demonic origin.
Thank you.