This is NOT a closed thread. Closed threads are devotionals, prayer threads and threads designated as a caucus for a particular confession.
On closed threads, challenges to the host confession are strictly not allowed. The assembly will not be disturbed.
This is an open thread. Challenges are allowed here, just like in a public square. Posters who take such challenges personally, should stay away from open threads and instead go to the closed threads - otherwise, every open thread he frequents is at risk of becoming a flame war.
Even atheists mount their challenges on open threads and surely seeing God referred to as a "pink unicorn" would cause an even greater offense (or should, but in fact rarely does, which indicates a deeper problem here.)
On open threads, the poster must "suffer the adverse testimony" and mount a rational argument to debunk misunderstandings, errors, false doctrine, etc.
I was unaware of Catholics swarming non-Catholic threads to the extent that Catholic threads are swarmed.