I'm not sure it isn't as Catholic thing as well. I attend a prayer group[ with mostly Catholics, and every other religion (Buddishm, Islam, Taoism) is accepted and A-OK; but those silly,ridiculous, fundamentalist prots !!! (I've actually heard that very phrase!) Just saying.
I think it's a human thing to divide ourselves into groups, and put everyone else into those "others". It gives a feeling of security.
>>I’m not sure it isn’t as Catholic thing as well<<
Don’t you consider Catholics to be Christian?