Actually this thread is about a Baptist who chose to be Catholic, not vice versa. One could make the argument once Baptist, always Baptist and people could debate it without being inflamed.
You just can't stand it that someone might reject your religion and you take it personally as if it is a rejection of you .... nay, rather ... a personal affront, like a slap in the face or the first punch
It seems to me this kind of projection is often indicative of a declarer's own emotional struggle in the face of spiritual struggle or trauma. I'm standing and desire no violence against Catholics or Baptists. Let the words of the Messah dwell richly in you and prompt you to good works as He taught.
It is well with my soul
I live in peace