Nah... you were never Calvinist, you just attended a... what was it, Presbyterian USA church? As if PCUSA were Calvinist in any sense of the word... that's just silly.
In order to renounce Calvinism, you would've had to have a rationale for explaining away the absolute-predestinarian implications of Matthew 11:20-27.
But, you don't have any such rationale. (Of course)
rest, if it aint an orthodox presby double pre-dest church (streching rack optional) it aint jack.
Rest, your time would be better spent in prayer than engaging such contentious souls
note to wrigley: note the courtesy ping ;0