It is a matter of precedence. If Joseph Smith can get away with creating a religion, then so can other people. Smith built his upon anti Presbyterianism (and to a lesser extent Baptist and Methodist beliefs). Others build theirs upon anti Catholicism.
Same methodology, same purposes.
Some people believe all they need to do to be tall is to stand next to short people. These are the ones who do nothing to exemplify why their particular faith or denomination is a living testimony to the Gospel. Instead they spend every waking moment posting about the shortcomings of someone else's faith and denomination. They especially need our prayers. Please keep them in your prayers and in your heart so that by your example they can be saved.
Jesu Kyrios
I'm violating my own standard here; but surely you realize that the Protestants built UPON Catholicism - merely minus a lot of the false baggage that had crept it.
FALSE is a bit strong.
How about unneeded instead.