Like you, I am Catholic and I've been told I am not a Christian by three FReeper Calvinists' I "could" name.Though myself an agnostic, half my family is Catholic, to the point of having included a cardinal a few years back. Therefore, my anti-Catholic-bigot detectors are pretty strong. I don't doubt for a second that Reconstructionists, if pressed, don't consider Catholics to be Christians. Indeed they would likely call them "idolators"...something else they have in common with fundamentalist Moslems.
-Eric