Who made you regret the most that you were not born Catholic?

No one has made me regret that. I am proud that I am not Catholic.

People are not born a certain religion, they are taught/indoctrinated into a religion.

No one is:  "born" any faith. Must still go thru the motions. 

 I went to a Catholic school, it turned me off to Catholicism. But, got  a medal blessed by Pope Paul, still have it.

 I have since realized  lot of cartels, Mafia go to Church, yet are still evil. Pancho Villa forced a Catholic priest  at gunpoint  to  marry himself to an  Indian girl . whom  the padre had made pregnant. Priests are notorious for sex with altar boys. Many  student's  in  my HS thought they could bully others, then confess, and it was "ok"

never ...  I am grateful the most for my religion

No one ever made me regret not being born a catholic. Strictly speaking, no one is born a catholic or a physicist or a dancer. These are all things we learn.

nobody I was.